diff --git a/boot.php b/boot.php
index 732816d1b9..27a5e8b3e4 100644
--- a/boot.php
+++ b/boot.php
@@ -21,16 +21,15 @@ require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'a
 
 use Friendica\App;
 use Friendica\Core\Addon;
-use Friendica\Core\System;
-use Friendica\Core\Cache;
 use Friendica\Core\Config;
-use Friendida\Core\L10n;
 use Friendica\Core\PConfig;
+use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
-use Friendica\Model\Contact;
 use Friendica\Database\DBStructure;
-use Friendica\Module\Login;
+use Friendica\Model\Contact;
+use Friendica\Util\Temporal;
+use Friendida\Core\L10n;
 
 require_once 'include/text.php';
 require_once 'include/datetime.php';
@@ -1144,14 +1143,14 @@ function feed_birthday($uid, $tz)
 	if (DBM::is_result($p)) {
 		$tmp_dob = substr($p[0]['dob'], 5);
 		if (intval($tmp_dob)) {
-			$y = datetime_convert($tz, $tz, 'now', 'Y');
+			$y = Temporal::convert('now', $tz, $tz, 'Y');
 			$bd = $y . '-' . $tmp_dob . ' 00:00';
 			$t_dob = strtotime($bd);
-			$now = strtotime(datetime_convert($tz, $tz, 'now'));
+			$now = strtotime(Temporal::convert('now', $tz, $tz));
 			if ($t_dob < $now) {
 				$bd = $y + 1 . '-' . $tmp_dob . ' 00:00';
 			}
-			$birthday = datetime_convert($tz, 'UTC', $bd, ATOM_TIME);
+			$birthday = Temporal::convert($bd, 'UTC', $tz, ATOM_TIME);
 		}
 	}
 
diff --git a/include/api.php b/include/api.php
index 4edced2214..727b2f028d 100644
--- a/include/api.php
+++ b/include/api.php
@@ -5,24 +5,25 @@
  * @file include/api.php
  * @todo Automatically detect if incoming data is HTML or BBCode
  */
+
 use Friendica\App;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\Addon;
-use Friendica\Core\System;
 use Friendica\Core\Config;
-use Friendica\Core\NotificationsManager;
 use Friendica\Core\L10n;
+use Friendica\Core\NotificationsManager;
 use Friendica\Core\PConfig;
+use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Group;
+use Friendica\Model\Item;
 use Friendica\Model\Mail;
 use Friendica\Model\Photo;
 use Friendica\Model\User;
-use Friendica\Model\Item;
 use Friendica\Network\FKOAuth1;
 use Friendica\Network\HTTPException;
 use Friendica\Network\HTTPException\BadRequestException;
@@ -31,11 +32,12 @@ use Friendica\Network\HTTPException\InternalServerErrorException;
 use Friendica\Network\HTTPException\MethodNotAllowedException;
 use Friendica\Network\HTTPException\NotFoundException;
 use Friendica\Network\HTTPException\NotImplementedException;
-use Friendica\Network\HTTPException\UnauthorizedException;
 use Friendica\Network\HTTPException\TooManyRequestsException;
+use Friendica\Network\HTTPException\UnauthorizedException;
 use Friendica\Object\Image;
 use Friendica\Protocol\Diaspora;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use Friendica\Util\XML;
 
 require_once 'include/bbcode.php';
@@ -109,7 +111,7 @@ function api_source()
 function api_date($str)
 {
 	// Wed May 23 06:01:13 +0000 2007
-	return datetime_convert('UTC', 'UTC', $str, "D M d H:i:s +0000 Y");
+	return Temporal::convert($str, 'UTC', 'UTC', "D M d H:i:s +0000 Y");
 }
 
 /**
@@ -458,7 +460,7 @@ function api_rss_extra(App $a, $arr, $user_info)
 		'self'         => System::baseUrl() . "/" . $a->query_string,
 		'base'         => System::baseUrl(),
 		'updated'      => api_date(null),
-		'atom_updated' => datetime_convert('UTC', 'UTC', 'now', ATOM_TIME),
+		'atom_updated' => Temporal::convert('now', 'UTC', 'UTC', ATOM_TIME),
 		'language'     => $user_info['language'],
 		'logo'         => System::baseUrl() . "/images/friendica-32.png",
 	];
@@ -3205,7 +3207,7 @@ function api_account_rate_limit_status($type)
 				'@attributes' => ["type" => "integer"],
 				'hourly-limit' => '150',
 				'@attributes2' => ["type" => "integer"],
-				'reset-time' => datetime_convert('UTC', 'UTC', 'now + 1 hour', ATOM_TIME),
+				'reset-time' => Temporal::convert('now + 1 hour', 'UTC', 'UTC', ATOM_TIME),
 				'@attributes3' => ["type" => "datetime"],
 				'reset_time_in_seconds' => strtotime('now + 1 hour'),
 				'@attributes4' => ["type" => "integer"],
@@ -3215,7 +3217,7 @@ function api_account_rate_limit_status($type)
 				'reset_time_in_seconds' => strtotime('now + 1 hour'),
 				'remaining_hits' => '150',
 				'hourly_limit' => '150',
-				'reset_time' => api_date(datetime_convert('UTC', 'UTC', 'now + 1 hour', ATOM_TIME)),
+				'reset_time' => api_date(Temporal::convert('now + 1 hour', 'UTC', 'UTC', ATOM_TIME)),
 			];
 	}
 
@@ -4214,7 +4216,7 @@ function api_fr_photo_create_update($type)
 			$result = q(
 				"UPDATE `photo` SET %s, `edited`='%s' WHERE `uid` = %d AND `resource-id` = '%s' AND `album` = '%s'",
 				$sql_extra,
-				datetime_convert(),   // update edited timestamp
+				Temporal::convert(),   // update edited timestamp
 				intval(api_user()),
 				dbesc($photo_id),
 				dbesc($album)
@@ -4418,7 +4420,7 @@ function api_account_update_profile_image($type)
 
 	q(
 		"UPDATE `contact` SET `avatar-date` = '%s' WHERE `self` = 1 AND `uid` = %d",
-		dbesc(datetime_convert()),
+		dbesc(Temporal::convert()),
 		intval(local_user())
 	);
 
diff --git a/include/bb2diaspora.php b/include/bb2diaspora.php
index 95047d61ae..47c5c98913 100644
--- a/include/bb2diaspora.php
+++ b/include/bb2diaspora.php
@@ -3,9 +3,11 @@
 use Friendica\Content\Text\BBCode;
 use Friendica\Content\Text\Markdown;
 use Friendica\Core\Addon;
+use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Model\Contact;
 use Friendica\Network\Probe;
+use Friendica\Util\Temporal;
 use League\HTMLToMarkdown\HtmlConverter;
 
 require_once 'include/event.php';
@@ -241,20 +243,19 @@ function format_event_diaspora($ev) {
 
 	$o .= '**' . (($ev['summary']) ? bb2diaspora($ev['summary']) : bb2diaspora($ev['desc'])) .  '**' . "\n";
 
+	// @todo What. Is. Going. On. With. This. Useless. Ternary. Operator? - mrpetovan
 	$o .= L10n::t('Starts:') . ' ' . '['
-		. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC',
-			$ev['start'] , $bd_format ))
-			:  day_translate(datetime_convert('UTC', 'UTC',
-			$ev['start'] , $bd_format)))
-		.  '](' . System::baseUrl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['start'])) . ")\n";
+		. (($ev['adjust']) ? day_translate(Temporal::convert($ev['start'], 'UTC', 'UTC', $bd_format))
+			:  day_translate(Temporal::convert($ev['start'], 'UTC', 'UTC', $bd_format))
+		)
+		.  '](' . System::baseUrl() . '/localtime/?f=&time=' . urlencode(Temporal::convert($ev['start'])) . ")\n";
 
 	if (! $ev['nofinish']) {
 		$o .= L10n::t('Finishes:') . ' ' . '['
-			. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC',
-				$ev['finish'] , $bd_format ))
-				:  day_translate(datetime_convert('UTC', 'UTC',
-				$ev['finish'] , $bd_format )))
-			. '](' . System::baseUrl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['finish'])) . ")\n";
+			. (($ev['adjust']) ? day_translate(Temporal::convert($ev['finish'], 'UTC', 'UTC', $bd_format))
+				:  day_translate(Temporal::convert($ev['finish'], 'UTC', 'UTC', $bd_format))
+			)
+			. '](' . System::baseUrl() . '/localtime/?f=&time=' . urlencode(Temporal::convert($ev['finish'])) . ")\n";
 	}
 
 	if (strlen($ev['location'])) {
diff --git a/include/conversation.php b/include/conversation.php
index 442ce4b8bb..755f247641 100644
--- a/include/conversation.php
+++ b/include/conversation.php
@@ -2,6 +2,7 @@
 /**
  * @file include/conversation.php
  */
+
 use Friendica\App;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
@@ -13,9 +14,10 @@ use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Profile;
-use Friendica\Object\Thread;
 use Friendica\Object\Post;
 use Friendica\Util\XML;
+use Friendica\Object\Thread;
+use Friendica\Util\Temporal;
 
 require_once "include/bbcode.php";
 require_once "include/acl_selectors.php";
@@ -788,7 +790,7 @@ function conversation(App $a, $items, $mode, $update, $preview = false) {
 					'categories' => $categories,
 					'folders' => $folders,
 					'text' => strip_tags($body_e),
-					'localtime' => datetime_convert('UTC', date_default_timezone_get(), $item['created'], 'r'),
+					'localtime' => Temporal::convert($item['created'], date_default_timezone_get(), 'UTC', 'r'),
 					'ago' => (($item['app']) ? L10n::t('%s from %s', relative_date($item['created']),$item['app']) : relative_date($item['created'])),
 					'location' => $location_e,
 					'indent' => '',
diff --git a/include/datetime.php b/include/datetime.php
index ff7b2a9a61..a917accc1d 100644
--- a/include/datetime.php
+++ b/include/datetime.php
@@ -7,18 +7,6 @@
 use Friendica\Model\Contact;
 use Friendica\Util\Temporal;
 
-function select_timezone($current = 'America/Los_Angeles') {
-	return Temporal::getTimezoneSelect($current);
-}
-
-function field_timezone($name='timezone', $label='', $current = 'America/Los_Angeles', $help = ''){
-	return Temporal::getTimezoneField($name, $label, $current, $help);
-}
-
-function datetime_convert($from = 'UTC', $to = 'UTC', $s = 'now', $fmt = "Y-m-d H:i:s") {
-	return Temporal::convert($s, $to, $from, $fmt);
-}
-
 function dob($dob) {
 	return Temporal::getDateofBirthField($dob);
 }
diff --git a/include/dba.php b/include/dba.php
index 154217a4c5..e7a5db1afb 100644
--- a/include/dba.php
+++ b/include/dba.php
@@ -1,7 +1,10 @@
 <?php
+
+use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Database\DBStructure;
+use Friendica\Util\Temporal;
 
 require_once('include/datetime.php');
 
@@ -187,7 +190,7 @@ class dba {
 
 			if ($log) {
 				$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
-				@file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
+				@file_put_contents($a->config["system"]["db_log_index"], Temporal::convert()."\t".
 						$row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 						basename($backtrace[1]["file"])."\t".
 						$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
@@ -492,7 +495,7 @@ class dba {
 				$duration = round($duration, 3);
 				$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 
-				@file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
+				@file_put_contents($a->config["system"]["db_log"], Temporal::convert()."\t".$duration."\t".
 						basename($backtrace[1]["file"])."\t".
 						$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 						substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
diff --git a/include/enotify.php b/include/enotify.php
index f07215da97..6b2f5e6ef9 100644
--- a/include/enotify.php
+++ b/include/enotify.php
@@ -2,13 +2,14 @@
 /**
  * @file include/enotify.php
  */
-use Friendica\App;
+
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Util\Emailer;
+use Friendica\Util\Temporal;
 
 require_once 'include/bbcode.php';
 require_once 'include/html2bbcode.php';
@@ -450,7 +451,7 @@ function notification($params)
 		$datarray['name_cache'] = strip_tags(bbcode($params['source_name']));
 		$datarray['url']   = $params['source_link'];
 		$datarray['photo'] = $params['source_photo'];
-		$datarray['date']  = datetime_convert();
+		$datarray['date']  = Temporal::convert();
 		$datarray['uid']   = $params['uid'];
 		$datarray['link']  = $itemlink;
 		$datarray['iid']   = $item_id;
diff --git a/include/event.php b/include/event.php
index 48edeeae64..6709362797 100644
--- a/include/event.php
+++ b/include/event.php
@@ -4,7 +4,6 @@
  * @brief functions specific to event handling
  */
 
-use Friendica\App;
 use Friendica\Content\Feature;
 use Friendica\Core\Addon;
 use Friendica\Core\L10n;
@@ -14,6 +13,7 @@ use Friendica\Database\DBM;
 use Friendica\Model\Item;
 use Friendica\Model\Profile;
 use Friendica\Util\Map;
+use Friendica\Util\Temporal;
 
 require_once 'include/bbcode.php';
 require_once 'include/datetime.php';
@@ -26,15 +26,13 @@ function format_event_html($ev, $simple = false) {
 
 	$bd_format = L10n::t('l F d, Y \@ g:i A') ; // Friday January 18, 2011 @ 8 AM.
 
-	$event_start = (($ev['adjust']) ? day_translate(datetime_convert('UTC', date_default_timezone_get(),
-			$ev['start'] , $bd_format ))
-			: day_translate(datetime_convert('UTC', 'UTC',
-			$ev['start'] , $bd_format)));
+	$event_start = (($ev['adjust']) ?
+		day_translate(Temporal::convert($ev['start'], date_default_timezone_get(), 'UTC', $bd_format))
+		: day_translate(Temporal::convert($ev['start'], 'UTC', 'UTC', $bd_format)));
 
-	$event_end = (($ev['adjust']) ? day_translate(datetime_convert('UTC', date_default_timezone_get(),
-				$ev['finish'] , $bd_format ))
-				: day_translate(datetime_convert('UTC', 'UTC',
-				$ev['finish'] , $bd_format )));
+	$event_end = (($ev['adjust']) ?
+		day_translate(Temporal::convert($ev['finish'] , date_default_timezone_get(), 'UTC', $bd_format ))
+		: day_translate(Temporal::convert($ev['finish'] , 'UTC', 'UTC', $bd_format )));
 
 	if ($simple) {
 		$o = "<h3>" . bbcode($ev['summary']) . "</h3>";
@@ -59,13 +57,13 @@ function format_event_html($ev, $simple = false) {
 	$o .= '<div class="summary event-summary">' . bbcode($ev['summary']) . '</div>' . "\r\n";
 
 	$o .= '<div class="event-start"><span class="event-label">' . L10n::t('Starts:') . '</span>&nbsp;<span class="dtstart" title="'
-		. datetime_convert('UTC', 'UTC', $ev['start'], (($ev['adjust']) ? ATOM_TIME : 'Y-m-d\TH:i:s' ))
+		. Temporal::convert($ev['start'], 'UTC', 'UTC', (($ev['adjust']) ? ATOM_TIME : 'Y-m-d\TH:i:s' ))
 		. '" >'.$event_start
 		. '</span></div>' . "\r\n";
 
 	if (! $ev['nofinish']) {
 		$o .= '<div class="event-end" ><span class="event-label">' . L10n::t('Finishes:') . '</span>&nbsp;<span class="dtend" title="'
-			. datetime_convert('UTC', 'UTC', $ev['finish'], (($ev['adjust']) ? ATOM_TIME : 'Y-m-d\TH:i:s' ))
+			. Temporal::convert($ev['finish'], 'UTC', 'UTC', (($ev['adjust']) ? ATOM_TIME : 'Y-m-d\TH:i:s' ))
 			. '" >'.$event_end
 			. '</span></div>' . "\r\n";
 	}
@@ -198,8 +196,8 @@ function sort_by_date($a) {
 
 function ev_compare($a,$b) {
 
-	$date_a = (($a['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $a['start']) : $a['start']);
-	$date_b = (($b['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $b['start']) : $b['start']);
+	$date_a = (($a['adjust']) ? Temporal::convert($a['start'], date_default_timezone_get()) : $a['start']);
+	$date_b = (($b['adjust']) ? Temporal::convert($b['start'], date_default_timezone_get()) : $b['start']);
 
 	if ($date_a === $date_b) {
 		return strcasecmp($a['desc'], $b['desc']);
@@ -242,8 +240,8 @@ function event_store($arr) {
 
 	$a = get_app();
 
-	$arr['created'] = (($arr['created'])     ? $arr['created']         : datetime_convert());
-	$arr['edited']  = (($arr['edited'])      ? $arr['edited']          : datetime_convert());
+	$arr['created'] = (($arr['created'])     ? $arr['created']         : Temporal::convert());
+	$arr['edited']  = (($arr['edited'])      ? $arr['edited']          : Temporal::convert());
 	$arr['type']    = (($arr['type'])        ? $arr['type']            : 'event' );
 	$arr['cid']     = ((intval($arr['cid'])) ? intval($arr['cid'])     : 0);
 	$arr['uri']     = (x($arr, 'uri')        ? $arr['uri']             : item_new_uri($a->get_hostname(), $arr['uid']));
@@ -593,15 +591,15 @@ function process_events($arr) {
 	$fmt = L10n::t('l, F j');
 	if (count($arr)) {
 		foreach ($arr as $rr) {
-			$j = (($rr['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $rr['start'], 'j') : datetime_convert('UTC', 'UTC', $rr['start'], 'j'));
-			$d = (($rr['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $rr['start'], $fmt) : datetime_convert('UTC', 'UTC', $rr['start'], $fmt));
+			$j = (($rr['adjust']) ? Temporal::convert($rr['start'], date_default_timezone_get(), 'UTC', 'j') : Temporal::convert($rr['start'], 'UTC', 'UTC', 'j'));
+			$d = (($rr['adjust']) ? Temporal::convert($rr['start'], date_default_timezone_get(), 'UTC', $fmt) : Temporal::convert($rr['start'], 'UTC', 'UTC', $fmt));
 			$d = day_translate($d);
 
-			$start = (($rr['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $rr['start'], 'c') : datetime_convert('UTC', 'UTC', $rr['start'], 'c'));
+			$start = (($rr['adjust']) ? Temporal::convert($rr['start'], date_default_timezone_get(), 'UTC', 'c') : Temporal::convert($rr['start'], 'UTC', 'UTC', 'c'));
 			if ($rr['nofinish']) {
 				$end = null;
 			} else {
-				$end = (($rr['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $rr['finish'], 'c') : datetime_convert('UTC', 'UTC', $rr['finish'], 'c'));
+				$end = (($rr['adjust']) ? Temporal::convert($rr['finish'], date_default_timezone_get(), 'UTC', 'c') : Temporal::convert($rr['finish'], 'UTC', 'UTC', 'c'));
 			}
 
 			$is_first = ($d !== $last_date);
@@ -926,22 +924,22 @@ function format_event_item($item) {
 	$tformat       = L10n::t('g:i A'); // 8:01 AM.
 
 	// Convert the time to different formats.
-	$dtstart_dt = (($item['event-adjust']) ? day_translate(datetime_convert('UTC', date_default_timezone_get(), $item['event-start'], $dformat)) : day_translate(datetime_convert('UTC', 'UTC', $item['event-start'], $dformat)));
-	$dtstart_title = datetime_convert('UTC', 'UTC', $item['event-start'], (($item['event-adjust']) ? ATOM_TIME : 'Y-m-d\TH:i:s'));
+	$dtstart_dt = (($item['event-adjust']) ? day_translate(Temporal::convert($item['event-start'], date_default_timezone_get(), 'UTC', $dformat)) : day_translate(Temporal::convert($item['event-start'], 'UTC', 'UTC', $dformat)));
+	$dtstart_title = Temporal::convert($item['event-start'], 'UTC', 'UTC', (($item['event-adjust']) ? ATOM_TIME : 'Y-m-d\TH:i:s'));
 	// Format: Jan till Dec.
-	$month_short = (($item['event-adjust']) ? day_short_translate(datetime_convert('UTC', date_default_timezone_get(), $item['event-start'], 'M')) : day_short_translate(datetime_convert('UTC', 'UTC', $item['event-start'], 'M')));
+	$month_short = (($item['event-adjust']) ? day_short_translate(Temporal::convert($item['event-start'], date_default_timezone_get(), 'UTC', 'M')) : day_short_translate(Temporal::convert($item['event-start'], 'UTC', 'UTC', 'M')));
 	// Format: 1 till 31.
-	$date_short = (($item['event-adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $item['event-start'], 'j') : datetime_convert('UTC', 'UTC', $item['event-start'], 'j'));
-	$start_time = (($item['event-adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $item['event-start'], $tformat) : datetime_convert('UTC', 'UTC', $item['event-start'], $tformat));
-	$start_short = (($item['event-adjust']) ? day_short_translate(datetime_convert('UTC', date_default_timezone_get(), $item['event-start'], $dformat_short)) : day_short_translate(datetime_convert('UTC', 'UTC', $item['event-start'], $dformat_short)));
+	$date_short = (($item['event-adjust']) ? Temporal::convert($item['event-start'], date_default_timezone_get(), 'UTC', 'j') : Temporal::convert($item['event-start'], 'UTC', 'UTC', 'j'));
+	$start_time = (($item['event-adjust']) ? Temporal::convert($item['event-start'], date_default_timezone_get(), 'UTC', $tformat) : Temporal::convert($item['event-start'], 'UTC', 'UTC', $tformat));
+	$start_short = (($item['event-adjust']) ? day_short_translate(Temporal::convert($item['event-start'], date_default_timezone_get(), 'UTC', $dformat_short)) : day_short_translate(Temporal::convert($item['event-start'], 'UTC', 'UTC', $dformat_short)));
 
 	// If the option 'nofinisch' isn't set, we need to format the finish date/time.
 	if (!$item['event-nofinish']) {
 		$finish = true;
-		$dtend_dt  = (($item['event-adjust']) ? day_translate(datetime_convert('UTC', date_default_timezone_get(), $item['event-finish'], $dformat)) : day_translate(datetime_convert('UTC', 'UTC', $item['event-finish'], $dformat)));
-		$dtend_title = datetime_convert('UTC', 'UTC', $item['event-finish'], (($item['event-adjust'])   ? ATOM_TIME : 'Y-m-d\TH:i:s'));
-		$end_short = (($item['event-adjust']) ? day_short_translate(datetime_convert('UTC', date_default_timezone_get(), $item['event-finish'], $dformat_short)) : day_short_translate(datetime_convert('UTC', 'UTC', $item['event-finish'], $dformat_short)));
-		$end_time = (($item['event-adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $item['event-finish'], $tformat) : datetime_convert('UTC', 'UTC', $item['event-finish'], $tformat));
+		$dtend_dt  = (($item['event-adjust']) ? day_translate(Temporal::convert($item['event-finish'], date_default_timezone_get(), 'UTC', $dformat)) : day_translate(Temporal::convert($item['event-finish'], 'UTC', 'UTC', $dformat)));
+		$dtend_title = Temporal::convert($item['event-finish'], 'UTC', 'UTC', (($item['event-adjust'])   ? ATOM_TIME : 'Y-m-d\TH:i:s'));
+		$end_short = (($item['event-adjust']) ? day_short_translate(Temporal::convert($item['event-finish'], date_default_timezone_get(), 'UTC', $dformat_short)) : day_short_translate(Temporal::convert($item['event-finish'], 'UTC', 'UTC', $dformat_short)));
+		$end_time = (($item['event-adjust']) ? Temporal::convert($item['event-finish'], date_default_timezone_get(), 'UTC', $tformat) : Temporal::convert($item['event-finish'], 'UTC', 'UTC', $tformat));
 		// Check if start and finish time is at the same day.
 		if (substr($dtstart_title, 0, 10) === substr($dtend_title, 0, 10)) {
 			$same_date = true;
diff --git a/include/items.php b/include/items.php
index 884b91393b..a5ba0718b9 100644
--- a/include/items.php
+++ b/include/items.php
@@ -2,28 +2,29 @@
 /**
  * @file include/items.php
  */
-use Friendica\App;
+
 use Friendica\Content\Feature;
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\PConfig;
-use Friendica\Core\Worker;
 use Friendica\Core\System;
+use Friendica\Core\Worker;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
+use Friendica\Model\Conversation;
 use Friendica\Model\GContact;
 use Friendica\Model\Group;
+use Friendica\Model\Item;
 use Friendica\Model\Term;
 use Friendica\Model\User;
-use Friendica\Model\Item;
-use Friendica\Model\Conversation;
 use Friendica\Object\Image;
 use Friendica\Protocol\DFRN;
-use Friendica\Protocol\OStatus;
 use Friendica\Protocol\Feed;
 use Friendica\Util\Network;
+use Friendica\Protocol\OStatus;
 use Friendica\Util\ParseUrl;
+use Friendica\Util\Temporal;
 
 require_once 'include/bbcode.php';
 require_once 'include/tags.php';
@@ -415,7 +416,7 @@ function drop_item($id) {
 
 /* arrange the list in years */
 function list_post_dates($uid, $wall) {
-	$dnow = datetime_convert('',date_default_timezone_get(), 'now','Y-m-d');
+	$dnow = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'Y-m-d');
 
 	$dthen = Item::firstPostDate($uid, $wall);
 	if (!$dthen) {
@@ -436,14 +437,14 @@ function list_post_dates($uid, $wall) {
 		$dyear = intval(substr($dnow, 0, 4));
 		$dstart = substr($dnow, 0, 8) . '01';
 		$dend = substr($dnow, 0, 8) . get_dim(intval($dnow), intval(substr($dnow, 5)));
-		$start_month = datetime_convert('', '', $dstart, 'Y-m-d');
-		$end_month = datetime_convert('', '', $dend, 'Y-m-d');
-		$str = day_translate(datetime_convert('', '', $dnow, 'F'));
+		$start_month = Temporal::convert($dstart, 'UTC', 'UTC', 'Y-m-d');
+		$end_month = Temporal::convert($dend, 'UTC', 'UTC', 'Y-m-d');
+		$str = day_translate(Temporal::convert($dnow, 'UTC', 'UTC', 'F'));
 		if (!$ret[$dyear]) {
 			$ret[$dyear] = [];
 		}
 		$ret[$dyear][] = [$str, $end_month, $start_month];
-		$dnow = datetime_convert('', '', $dnow . ' -1 month', 'Y-m-d');
+		$dnow = Temporal::convert($dnow . ' -1 month', 'UTC', 'UTC', 'Y-m-d');
 	}
 	return $ret;
 }
@@ -473,7 +474,7 @@ function posted_date_widget($url, $uid, $wall) {
 		return $o;
 	}
 
-	$cutoff_year = intval(datetime_convert('',date_default_timezone_get(), 'now', 'Y')) - $visible_years;
+	$cutoff_year = intval(Temporal::convert('now', date_default_timezone_get(), 'UTC', 'Y')) - $visible_years;
 	$cutoff = ((array_key_exists($cutoff_year, $ret))? true : false);
 
 	$o = replace_macros(get_markup_template('posted_date_widget.tpl'),[
diff --git a/include/security.php b/include/security.php
index 0011542938..9b14ed3415 100644
--- a/include/security.php
+++ b/include/security.php
@@ -2,7 +2,7 @@
 /**
  * @file include/security.php
  */
-use Friendica\App;
+
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
@@ -10,6 +10,7 @@ use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Group;
+use Friendica\Util\Temporal;
 
 /**
  * @brief Calculate the hash that is needed for the "Friendica" cookie
@@ -141,10 +142,10 @@ function authenticate_success($user_record, $login_initial = false, $interactive
 	header('X-Account-Management-Status: active; name="' . $a->user['username'] . '"; id="' . $a->user['nickname'] . '"');
 
 	if ($login_initial || $login_refresh) {
-		dba::update('user', ['login_date' => datetime_convert()], ['uid' => $_SESSION['uid']]);
+		dba::update('user', ['login_date' => Temporal::convert()], ['uid' => $_SESSION['uid']]);
 
 		// Set the login date for all identities of the user
-		dba::update('user', ['login_date' => datetime_convert()],
+		dba::update('user', ['login_date' => Temporal::convert()],
 			['password' => $master_record['password'], 'email' => $master_record['email'], 'account_removed' => false]);
 	}
 
diff --git a/include/text.php b/include/text.php
index 3244d7bb97..72787ae57e 100644
--- a/include/text.php
+++ b/include/text.php
@@ -2,6 +2,7 @@
 /**
  * @file include/text.php
  */
+
 use Friendica\App;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
@@ -15,6 +16,7 @@ use Friendica\Database\DBM;
 use Friendica\Model\Profile;
 use Friendica\Model\Term;
 use Friendica\Util\Map;
+use Friendica\Util\Temporal;
 
 require_once "mod/proxy.php";
 require_once "include/conversation.php";
@@ -721,7 +723,7 @@ function logger($msg, $level = 0) {
 
 	$callers = debug_backtrace();
 	$logline = sprintf("%s@%s\t[%s]:%s:%s:%s\t%s\n",
-			datetime_convert('UTC', 'UTC', 'now', 'Y-m-d\TH:i:s\Z'),
+			Temporal::convert('now', 'UTC', 'UTC', 'Y-m-d\TH:i:s\Z'),
 			$process_id,
 			$LOGGER_LEVELS[$level],
 			basename($callers[0]['file']),
@@ -787,7 +789,7 @@ function dlogger($msg, $level = 0) {
 
 	$callers = debug_backtrace();
 	$logline = sprintf("%s@\t%s:\t%s:\t%s\t%s\t%s\n",
-			datetime_convert(),
+			Temporal::convert(),
 			$process_id,
 			basename($callers[0]['file']),
 			$callers[0]['line'],
diff --git a/mod/admin.php b/mod/admin.php
index d7495340b4..9ce4f8d65d 100644
--- a/mod/admin.php
+++ b/mod/admin.php
@@ -17,9 +17,10 @@ use Friendica\Core\Worker;
 use Friendica\Database\DBM;
 use Friendica\Database\DBStructure;
 use Friendica\Model\Contact;
-use Friendica\Model\User;
 use Friendica\Model\Item;
+use Friendica\Model\User;
 use Friendica\Module\Login;
+use Friendica\Util\Temporal;
 
 require_once 'include/enotify.php';
 require_once 'include/text.php';
@@ -739,7 +740,7 @@ function admin_page_summary(App $a)
 	if (!$last_worker_call) {
 		$showwarning = true;
 		$warningtext[] = L10n::t('The worker was never executed. Please check your database structure!');
-	} elseif ((strtotime(datetime_convert()) - strtotime($last_worker_call)) > 60 * 60) {
+	} elseif ((strtotime(Temporal::convert()) - strtotime($last_worker_call)) > 60 * 60) {
 		$showwarning = true;
 		$warningtext[] = L10n::t('The last worker execution was on %s UTC. This is older than one hour. Please check your crontab settings.', $last_worker_call);
 	}
diff --git a/mod/cal.php b/mod/cal.php
index a59643cfc2..71380373e5 100644
--- a/mod/cal.php
+++ b/mod/cal.php
@@ -5,6 +5,7 @@
  * 	This calendar is for profile visitors and contains only the events
  * 	of the profile owner
  */
+
 use Friendica\App;
 use Friendica\Content\Feature;
 use Friendica\Content\Nav;
@@ -16,6 +17,7 @@ use Friendica\Model\Contact;
 use Friendica\Model\Group;
 use Friendica\Model\Profile;
 use Friendica\Protocol\DFRN;
+use Friendica\Util\Temporal;
 
 require_once 'include/event.php';
 
@@ -150,8 +152,8 @@ function cal_content(App $a)
 
 	// The view mode part is similiar to /mod/events.php
 	if ($mode == 'view') {
-		$thisyear = datetime_convert('UTC', date_default_timezone_get(), 'now', 'Y');
-		$thismonth = datetime_convert('UTC', date_default_timezone_get(), 'now', 'm');
+		$thisyear = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'Y');
+		$thismonth = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'm');
 		if (!$y) {
 			$y = intval($thisyear);
 		}
@@ -201,11 +203,11 @@ function cal_content(App $a)
 			}
 		}
 
-		$start = datetime_convert('UTC', 'UTC', $start);
-		$finish = datetime_convert('UTC', 'UTC', $finish);
+		$start = Temporal::convert($start);
+		$finish = Temporal::convert($finish);
 
-		$adjust_start = datetime_convert('UTC', date_default_timezone_get(), $start);
-		$adjust_finish = datetime_convert('UTC', date_default_timezone_get(), $finish);
+		$adjust_start = Temporal::convert($start, date_default_timezone_get());
+		$adjust_finish = Temporal::convert($finish, date_default_timezone_get());
 
 		// put the event parametes in an array so we can better transmit them
 		$event_params = [
@@ -229,7 +231,7 @@ function cal_content(App $a)
 		if (DBM::is_result($r)) {
 			$r = sort_by_date($r);
 			foreach ($r as $rr) {
-				$j = (($rr['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $rr['start'], 'j') : datetime_convert('UTC', 'UTC', $rr['start'], 'j'));
+				$j = (($rr['adjust']) ? Temporal::convert($rr['start'], date_default_timezone_get(), 'UTC', 'j') : Temporal::convert($rr['start'], 'UTC', 'UTC', 'j'));
 				if (!x($links, $j)) {
 					$links[$j] = System::baseUrl() . '/' . $a->cmd . '#link-' . $j;
 				}
diff --git a/mod/contacts.php b/mod/contacts.php
index 12f6075dd6..43e6ae826d 100644
--- a/mod/contacts.php
+++ b/mod/contacts.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/contacts.php
  */
+
 use Friendica\App;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Nav;
@@ -16,6 +17,7 @@ use Friendica\Model\GContact;
 use Friendica\Model\Group;
 use Friendica\Model\Profile;
 use Friendica\Network\Probe;
+use Friendica\Util\Temporal;
 
 require_once 'mod/proxy.php';
 
@@ -538,7 +540,7 @@ function contacts_content(App $a)
 
 		$insecure = L10n::t('Private communications are not available for this contact.');
 
-		$last_update = (($contact['last-update'] <= NULL_DATE) ? L10n::t('Never') : datetime_convert('UTC', date_default_timezone_get(), $contact['last-update'], 'D, j M Y, g:i A'));
+		$last_update = (($contact['last-update'] <= NULL_DATE) ? L10n::t('Never') : Temporal::convert($contact['last-update'], date_default_timezone_get(), 'UTC', 'D, j M Y, g:i A'));
 
 		if ($contact['last-update'] > NULL_DATE) {
 			$last_update .= ' ' . (($contact['last-update'] <= $contact['success_update']) ? L10n::t("\x28Update was successful\x29") : L10n::t("\x28Update was not successful\x29"));
diff --git a/mod/dfrn_confirm.php b/mod/dfrn_confirm.php
index 9106f58802..95a928c373 100644
--- a/mod/dfrn_confirm.php
+++ b/mod/dfrn_confirm.php
@@ -32,6 +32,7 @@ use Friendica\Network\Probe;
 use Friendica\Protocol\Diaspora;
 use Friendica\Util\Crypto;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use Friendica\Util\XML;
 
 require_once 'include/enotify.php';
@@ -326,8 +327,8 @@ function dfrn_confirm_post(App $a, $handsfree = null)
 				`network` = '%s' WHERE `id` = %d
 			",
 				intval($new_relation),
-				dbesc(datetime_convert()),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
+				dbesc(Temporal::convert()),
 				intval($duplex),
 				intval($hidden),
 				dbesc(NETWORK_DFRN),
@@ -377,8 +378,8 @@ function dfrn_confirm_post(App $a, $handsfree = null)
 				`rel` = %d
 				WHERE `id` = %d
 			",
-				dbesc(datetime_convert()),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
+				dbesc(Temporal::convert()),
 				dbesc($addr),
 				dbesc($notify),
 				dbesc($poll),
@@ -618,8 +619,8 @@ function dfrn_confirm_post(App $a, $handsfree = null)
 			`network` = '%s' WHERE `id` = %d
 		",
 			intval($new_relation),
-			dbesc(datetime_convert()),
-			dbesc(datetime_convert()),
+			dbesc(Temporal::convert()),
+			dbesc(Temporal::convert()),
 			intval($duplex),
 			intval($forum),
 			intval($prv),
diff --git a/mod/dfrn_request.php b/mod/dfrn_request.php
index 41d13ff811..06b2e6b778 100644
--- a/mod/dfrn_request.php
+++ b/mod/dfrn_request.php
@@ -11,6 +11,7 @@
  *    You also find a graphic which describes the confirmation process at
  *    https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_request.png
  */
+
 use Friendica\App;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
@@ -19,11 +20,12 @@ use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Group;
-use Friendica\Model\User;
 use Friendica\Model\Profile;
+use Friendica\Model\User;
 use Friendica\Module\Login;
 use Friendica\Network\Probe;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 
 require_once 'include/enotify.php';
 
@@ -135,7 +137,7 @@ function dfrn_request_post(App $a)
 						`request`, `confirm`, `notify`, `poll`, `poco`, `network`, `aes_allow`, `hidden`, `blocked`, `pending`)
 						VALUES ( %d, '%s', '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d)",
 						intval(local_user()),
-						datetime_convert(),
+						Temporal::convert(),
 						dbesc($dfrn_url),
 						dbesc(normalise_link($dfrn_url)),
 						$parms['addr'],
@@ -239,7 +241,7 @@ function dfrn_request_post(App $a)
 		// Block friend request spam
 		if ($maxreq) {
 			$r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d",
-				dbesc(datetime_convert('UTC', 'UTC', 'now - 24 hours')),
+				dbesc(Temporal::convert('now - 24 hours')),
 				intval($uid)
 			);
 			if (DBM::is_result($r) && count($r) > $maxreq) {
@@ -380,7 +382,7 @@ function dfrn_request_post(App $a)
 					`request`, `confirm`, `notify`, `poll`, `poco`, `network`, `blocked`, `pending` )
 					VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d )",
 					intval($uid),
-					dbesc(datetime_convert()),
+					dbesc(Temporal::convert()),
 					$parms['url'],
 					dbesc(normalise_link($url)),
 					$parms['addr'],
@@ -428,7 +430,7 @@ function dfrn_request_post(App $a)
 					((x($_POST,'knowyou') && ($_POST['knowyou'] == 1)) ? 1 : 0),
 					dbesc(notags(trim($_POST['dfrn-request-message']))),
 					dbesc($hash),
-					dbesc(datetime_convert())
+					dbesc(Temporal::convert())
 				);
 			}
 
diff --git a/mod/events.php b/mod/events.php
index 8dec614606..703b1c0efc 100644
--- a/mod/events.php
+++ b/mod/events.php
@@ -3,15 +3,16 @@
  * @file mod/events.php
  * @brief The events module
  */
+
 use Friendica\App;
 use Friendica\Content\Nav;
-use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
-use Friendica\Model\Profile;
 use Friendica\Model\Item;
+use Friendica\Model\Profile;
+use Friendica\Util\Temporal;
 
 require_once 'include/bbcode.php';
 require_once 'include/datetime.php';
@@ -75,14 +76,14 @@ function events_post(App $a) {
 	}
 
 	if ($adjust) {
-		$start = datetime_convert(date_default_timezone_get(), 'UTC', $start);
+		$start = Temporal::convert($start, 'UTC', date_default_timezone_get());
 		if (! $nofinish) {
-			$finish = datetime_convert(date_default_timezone_get(), 'UTC', $finish);
+			$finish = Temporal::convert($finish, 'UTC', date_default_timezone_get());
 		}
 	} else {
-		$start = datetime_convert('UTC', 'UTC', $start);
+		$start = Temporal::convert($start);
 		if (! $nofinish) {
-			$finish = datetime_convert('UTC', 'UTC', $finish);
+			$finish = Temporal::convert($finish);
 		}
 	}
 
@@ -275,8 +276,8 @@ function events_content(App $a) {
 	// The view mode part is similiar to /mod/cal.php
 	if ($mode == 'view') {
 
-		$thisyear  = datetime_convert('UTC', date_default_timezone_get(), 'now', 'Y');
-		$thismonth = datetime_convert('UTC', date_default_timezone_get(), 'now', 'm');
+		$thisyear  = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'Y');
+		$thismonth = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'm');
 		if (! $y) {
 			$y = intval($thisyear);
 		}
@@ -322,11 +323,11 @@ function events_content(App $a) {
 			}
 		}
 
-		$start  = datetime_convert('UTC', 'UTC', $start);
-		$finish = datetime_convert('UTC', 'UTC', $finish);
+		$start  = Temporal::convert($start);
+		$finish = Temporal::convert($finish);
 
-		$adjust_start  = datetime_convert('UTC', date_default_timezone_get(), $start);
-		$adjust_finish = datetime_convert('UTC', date_default_timezone_get(), $finish);
+		$adjust_start  = Temporal::convert($start, date_default_timezone_get());
+		$adjust_finish = Temporal::convert($finish, date_default_timezone_get());
 
 		// put the event parametes in an array so we can better transmit them
 		$event_params = [
@@ -350,7 +351,7 @@ function events_content(App $a) {
 		if (DBM::is_result($r)) {
 			$r = sort_by_date($r);
 			foreach ($r as $rr) {
-				$j = (($rr['adjust']) ? datetime_convert('UTC', date_default_timezone_get(), $rr['start'], 'j') : datetime_convert('UTC', 'UTC', $rr['start'], 'j'));
+				$j = (($rr['adjust']) ? Temporal::convert($rr['start'], date_default_timezone_get(), 'UTC', 'j') : Temporal::convert($rr['start'], 'UTC', 'UTC', 'j'));
 				if (! x($links,$j)) {
 					$links[$j] = System::baseUrl() . '/' . $a->cmd . '#link-' . $j;
 				}
@@ -464,19 +465,19 @@ function events_content(App $a) {
 			$tz = (($orig_event['adjust']) ? date_default_timezone_get() : 'UTC');
 		}
 
-		$syear  = datetime_convert('UTC', $tz, $sdt, 'Y');
-		$smonth = datetime_convert('UTC', $tz, $sdt, 'm');
-		$sday   = datetime_convert('UTC', $tz, $sdt, 'd');
+		$syear  = Temporal::convert($sdt, $tz, 'UTC', 'Y');
+		$smonth = Temporal::convert($sdt, $tz, 'UTC', 'm');
+		$sday   = Temporal::convert($sdt, $tz, 'UTC', 'd');
 
-		$shour   = ((x($orig_event)) ? datetime_convert('UTC', $tz, $sdt, 'H') : 0);
-		$sminute = ((x($orig_event)) ? datetime_convert('UTC', $tz, $sdt, 'i') : 0);
+		$shour   = ((x($orig_event)) ? Temporal::convert($sdt, $tz, 'UTC', 'H') : 0);
+		$sminute = ((x($orig_event)) ? Temporal::convert($sdt, $tz, 'UTC', 'i') : 0);
 
-		$fyear  = datetime_convert('UTC', $tz, $fdt, 'Y');
-		$fmonth = datetime_convert('UTC', $tz, $fdt, 'm');
-		$fday   = datetime_convert('UTC', $tz, $fdt, 'd');
+		$fyear  = Temporal::convert($fdt, $tz, 'UTC', 'Y');
+		$fmonth = Temporal::convert($fdt, $tz, 'UTC', 'm');
+		$fday   = Temporal::convert($fdt, $tz, 'UTC', 'd');
 
-		$fhour   = ((x($orig_event)) ? datetime_convert('UTC', $tz, $fdt, 'H') : 0);
-		$fminute = ((x($orig_event)) ? datetime_convert('UTC', $tz, $fdt, 'i') : 0);
+		$fhour   = ((x($orig_event)) ? Temporal::convert($fdt, $tz, 'UTC', 'H') : 0);
+		$fminute = ((x($orig_event)) ? Temporal::convert($fdt, $tz, 'UTC', 'i') : 0);
 
 		require_once 'include/acl_selectors.php' ;
 
diff --git a/mod/fsuggest.php b/mod/fsuggest.php
index 99a7f7d525..92c41661f2 100644
--- a/mod/fsuggest.php
+++ b/mod/fsuggest.php
@@ -2,10 +2,12 @@
 /**
  * @file mod/fsuggest.php
  */
+
 use Friendica\App;
 use Friendica\Core\L10n;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
+use Friendica\Util\Temporal;
 
 function fsuggest_post(App $a)
 {
@@ -50,7 +52,7 @@ function fsuggest_post(App $a)
 				dbesc($r[0]['request']),
 				dbesc($r[0]['photo']),
 				dbesc($hash),
-				dbesc(datetime_convert())
+				dbesc(Temporal::convert())
 			);
 			$r = q("SELECT `id` FROM `fsuggest` WHERE `note` = '%s' AND `uid` = %d LIMIT 1",
 				dbesc($hash),
diff --git a/mod/install.php b/mod/install.php
index c5f2e985f9..1ddc8fbad1 100644
--- a/mod/install.php
+++ b/mod/install.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/install.php
  */
+
 use Friendica\App;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
@@ -9,6 +10,7 @@ use Friendica\Database\DBM;
 use Friendica\Database\DBStructure;
 use Friendica\Object\Image;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 
 $install_wizard_pass = 1;
 
@@ -279,7 +281,7 @@ function install_content(App $a) {
 				'$adminmail' => ['adminmail', L10n::t('Site administrator email address'), $adminmail, L10n::t('Your account email address must match this in order to use the web admin panel.'), 'required', 'autofocus', 'email'],
 
 
-				'$timezone' => field_timezone('timezone', L10n::t('Please select a default timezone for your website'), $timezone, ''),
+				'$timezone' => Temporal::getTimezoneField('timezone', L10n::t('Please select a default timezone for your website'), $timezone, ''),
 				'$language' => ['language', L10n::t('System Language:'), 'en', L10n::t('Set the default language for your Friendica installation interface and to send emails.'), $lang_choices],
 				'$baseurl' => System::baseUrl(),
 
diff --git a/mod/invite.php b/mod/invite.php
index 2caba92efc..3b3b94c3d1 100644
--- a/mod/invite.php
+++ b/mod/invite.php
@@ -5,12 +5,14 @@
  * Send email invitations to join social network
  *
  */
+
 use Friendica\App;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Protocol\Email;
+use Friendica\Util\Temporal;
 
 function invite_post(App $a)
 {
@@ -60,7 +62,7 @@ function invite_post(App $a)
 
 			$r = q("INSERT INTO `register` (`hash`,`created`) VALUES ('%s', '%s') ",
 				dbesc($code),
-				dbesc(datetime_convert())
+				dbesc(Temporal::convert())
 			);
 
 			if (! is_site_admin()) {
diff --git a/mod/item.php b/mod/item.php
index 46a7b184c1..7a5a8aab48 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -14,6 +14,7 @@
  * All of these become an "item" which is our basic unit of
  * information.
  */
+
 use Friendica\App;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\Addon;
@@ -25,10 +26,10 @@ use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\GContact;
 use Friendica\Model\Item;
-use Friendica\Network\Probe;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\Email;
 use Friendica\Util\Emailer;
+use Friendica\Util\Temporal;
 
 require_once 'include/enotify.php';
 require_once 'include/tags.php';
@@ -600,11 +601,11 @@ function item_post(App $a) {
 	$datarray['author-link']   = $author['url'];
 	$datarray['author-avatar'] = $author['thumb'];
 	$datarray['author-id']     = Contact::getIdForURL($datarray['author-link'], 0);
-	$datarray['created']       = datetime_convert();
-	$datarray['edited']        = datetime_convert();
-	$datarray['commented']     = datetime_convert();
-	$datarray['received']      = datetime_convert();
-	$datarray['changed']       = datetime_convert();
+	$datarray['created']       = Temporal::convert();
+	$datarray['edited']        = Temporal::convert();
+	$datarray['commented']     = Temporal::convert();
+	$datarray['received']      = Temporal::convert();
+	$datarray['changed']       = Temporal::convert();
 	$datarray['extid']         = $extid;
 	$datarray['guid']          = $guid;
 	$datarray['uri']           = $uri;
@@ -708,8 +709,8 @@ function item_post(App $a) {
 			'file' => $datarray['file'],
 			'rendered-html' => $datarray['rendered-html'],
 			'rendered-hash' => $datarray['rendered-hash'],
-			'edited' => datetime_convert(),
-			'changed' => datetime_convert()];
+			'edited' => Temporal::convert(),
+			'changed' => Temporal::convert()];
 
 		Item::update($fields, ['id' => $post_id]);
 
diff --git a/mod/localtime.php b/mod/localtime.php
index f7129656f4..29402b34eb 100644
--- a/mod/localtime.php
+++ b/mod/localtime.php
@@ -2,9 +2,11 @@
 /**
  * @file mod/localtime.php
  */
+
 use Friendica\App;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
+use Friendica\Util\Temporal;
 
 require_once 'include/datetime.php';
 
@@ -18,7 +20,7 @@ function localtime_post(App $a)
 	$bd_format = L10n::t('l F d, Y \@ g:i A') ; // Friday January 18, 2011 @ 8 AM
 
 	if ($_POST['timezone']) {
-		$a->data['mod-localtime'] = datetime_convert('UTC', $_POST['timezone'], $t, $bd_format);
+		$a->data['mod-localtime'] = Temporal::convert($t, $_POST['timezone'], 'UTC', $bd_format);
 	}
 }
 
@@ -50,7 +52,7 @@ function localtime_content(App $a)
 
 	$o .= '<p>' . L10n::t('Please select your timezone:') . '</p>';
 
-	$o .= select_timezone(($_REQUEST['timezone']) ? $_REQUEST['timezone'] : 'America/Los_Angeles');
+	$o .= Temporal::getTimezoneSelect(($_REQUEST['timezone']) ? $_REQUEST['timezone'] : 'America/Los_Angeles');
 
 	$o .= '<input type="submit" name="submit" value="' . L10n::t('Submit') . '" /></form>';
 
diff --git a/mod/lostpass.php b/mod/lostpass.php
index c39a38cca9..87e492a92a 100644
--- a/mod/lostpass.php
+++ b/mod/lostpass.php
@@ -8,6 +8,7 @@ use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\User;
+use Friendica\Util\Temporal;
 
 require_once 'boot.php';
 require_once 'include/datetime.php';
@@ -32,7 +33,7 @@ function lostpass_post(App $a)
 
 	$fields = [
 		'pwdreset' => $pwdreset_token,
-		'pwdreset_time' => datetime_convert()
+		'pwdreset_time' => Temporal::convert()
 	];
 	$result = dba::update('user', $fields, ['uid' => $user['uid']]);
 	if ($result) {
@@ -91,7 +92,7 @@ function lostpass_content(App $a)
 		}
 
 		// Password reset requests expire in 60 minutes
-		if ($user['pwdreset_time'] < datetime_convert('UTC', 'UTC', 'now - 1 hour')) {
+		if ($user['pwdreset_time'] < Temporal::convert('now - 1 hour')) {
 			$fields = [
 				'pwdreset' => null,
 				'pwdreset_time' => null
diff --git a/mod/message.php b/mod/message.php
index 20d024feb7..c1b2d989e9 100644
--- a/mod/message.php
+++ b/mod/message.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/message.php
  */
+
 use Friendica\App;
 use Friendica\Content\Nav;
 use Friendica\Content\Smilies;
@@ -10,6 +11,7 @@ use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Mail;
+use Friendica\Util\Temporal;
 
 require_once 'include/acl_selectors.php';
 require_once 'include/conversation.php';
@@ -395,7 +397,7 @@ function message_content(App $a)
 				'body' => $body_e,
 				'delete' => L10n::t('Delete message'),
 				'to_name' => $to_name_e,
-				'date' => datetime_convert('UTC', date_default_timezone_get(), $message['created'], 'D, d M Y - g:i A'),
+				'date' => Temporal::convert($message['created'], date_default_timezone_get(), 'UTC', 'D, d M Y - g:i A'),
 				'ago' => relative_date($message['created']),
 			];
 
@@ -496,7 +498,7 @@ function render_messages(array $msg, $t)
 			'$delete' => L10n::t('Delete conversation'),
 			'$body' => $body_e,
 			'$to_name' => $to_name_e,
-			'$date' => datetime_convert('UTC', date_default_timezone_get(), $rr['mailcreated'], L10n::t('D, d M Y - g:i A')),
+			'$date' => Temporal::convert($rr['mailcreated'], date_default_timezone_get(), 'UTC', L10n::t('D, d M Y - g:i A')),
 			'$ago' => relative_date($rr['mailcreated']),
 			'$seen' => $rr['mailseen'],
 			'$count' => L10n::tt('%d message', '%d messages', $rr['count']),
diff --git a/mod/network.php b/mod/network.php
index a1100352cd..b5f58be40b 100644
--- a/mod/network.php
+++ b/mod/network.php
@@ -3,14 +3,15 @@
 /**
  * @file mod/network.php
  */
+
 use Friendica\App;
 use Friendica\Content\Feature;
 use Friendica\Content\ForumManager;
 use Friendica\Content\Nav;
 use Friendica\Content\Widget;
 use Friendica\Core\Addon;
-use Friendica\Core\L10n;
 use Friendica\Core\Config;
+use Friendica\Core\L10n;
 use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
@@ -18,6 +19,7 @@ use Friendica\Model\Contact;
 use Friendica\Model\Group;
 use Friendica\Model\Profile;
 use Friendica\Module\Login;
+use Friendica\Util\Temporal;
 
 require_once 'include/conversation.php';
 require_once 'include/items.php';
@@ -679,11 +681,11 @@ function networkThreadedView(App $a, $update = 0)
 
 	if ($datequery) {
 		$sql_extra3 .= protect_sprintf(sprintf(" AND $sql_table.created <= '%s' ",
-				dbesc(datetime_convert(date_default_timezone_get(), '', $datequery))));
+				dbesc(Temporal::convert($datequery, 'UTC', date_default_timezone_get()))));
 	}
 	if ($datequery2) {
 		$sql_extra3 .= protect_sprintf(sprintf(" AND $sql_table.created >= '%s' ",
-				dbesc(datetime_convert(date_default_timezone_get(), '', $datequery2))));
+				dbesc(Temporal::convert($datequery2, 'UTC', date_default_timezone_get()))));
 	}
 
 	$sql_order = '';
@@ -788,8 +790,8 @@ function networkThreadedView(App $a, $update = 0)
 			$top_limit = current($r)['order_date'];
 			$bottom_limit = end($r)['order_date'];
 		} else {
-			$top_limit = datetime_convert();
-			$bottom_limit = datetime_convert();
+			$top_limit = Temporal::convert();
+			$bottom_limit = Temporal::convert();
 		}
 
 		// When checking for updates we need to fetch from the newest date to the newest date before
@@ -802,7 +804,7 @@ function networkThreadedView(App $a, $update = 0)
 			$top_limit = $last_date;
 		} elseif ($a->pager['page'] == 1) {
 			// Highest possible top limit when we are on the first page
-			$top_limit = datetime_convert();
+			$top_limit = Temporal::convert();
 		}
 
 		$items = dba::p("SELECT `item`.`id` AS `item_id`, `item`.`network` AS `item_network`, `contact`.`uid` AS `contact_uid` FROM `item`
diff --git a/mod/photos.php b/mod/photos.php
index a9e77c7c39..2a1e7a4cdc 100644
--- a/mod/photos.php
+++ b/mod/photos.php
@@ -2,13 +2,14 @@
 /**
  * @file mod/photos.php
  */
+
 use Friendica\App;
 use Friendica\Content\Feature;
 use Friendica\Content\Nav;
 use Friendica\Core\Addon;
+use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
-use Friendica\Core\Config;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
@@ -19,6 +20,8 @@ use Friendica\Model\Profile;
 use Friendica\Network\Probe;
 use Friendica\Object\Image;
 use Friendica\Protocol\DFRN;
+use Friendica\Util\Map;
+use Friendica\Util\Temporal;
 
 require_once 'include/items.php';
 require_once 'include/acl_selectors.php';
@@ -288,7 +291,7 @@ function photos_post(App $a)
 			if (DBM::is_result($r)) {
 				foreach ($r as $rr) {
 					q("UPDATE `item` SET `deleted` = 1, `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d",
-						dbesc(datetime_convert()),
+						dbesc(Temporal::convert()),
 						dbesc($rr['parent-uri']),
 						intval($page_owner_uid)
 					);
@@ -361,8 +364,8 @@ function photos_post(App $a)
 			);
 			if (DBM::is_result($i)) {
 				q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d",
-					dbesc(datetime_convert()),
-					dbesc(datetime_convert()),
+					dbesc(Temporal::convert()),
+					dbesc(Temporal::convert()),
 					dbesc($i[0]['uri']),
 					intval($page_owner_uid)
 				);
@@ -399,7 +402,7 @@ function photos_post(App $a)
 		$resource_id = $a->argv[2];
 
 		if (!strlen($albname)) {
-			$albname = datetime_convert('UTC',date_default_timezone_get(),'now', 'Y');
+			$albname = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'Y');
 		}
 
 		if (x($_POST,'rotate') !== false &&
@@ -646,8 +649,8 @@ function photos_post(App $a)
 			$r = q("UPDATE `item` SET `tag` = '%s', `inform` = '%s', `edited` = '%s', `changed` = '%s' WHERE `id` = %d AND `uid` = %d",
 				dbesc($newtag),
 				dbesc($newinform),
-				dbesc(datetime_convert()),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
+				dbesc(Temporal::convert()),
 				intval($item_id),
 				intval($page_owner_uid)
 			);
@@ -735,7 +738,7 @@ function photos_post(App $a)
 		if (strlen($newalbum)) {
 			$album = $newalbum;
 		} else {
-			$album = datetime_convert('UTC',date_default_timezone_get(),'now', 'Y');
+			$album = Temporal::convert('now', date_default_timezone_get(), 'UTC', 'Y');
 		}
 	}
 
@@ -1358,7 +1361,7 @@ function photos_content(App $a)
 		$photo = [
 			'href' => 'photo/' . $hires['resource-id'] . '-' . $hires['scale'] . '.' . $phototypes[$hires['type']],
 			'title'=> L10n::t('View Full Size'),
-			'src'  => 'photo/' . $lores['resource-id'] . '-' . $lores['scale'] . '.' . $phototypes[$lores['type']] . '?f=&_u=' . datetime_convert('','','','ymdhis'),
+			'src'  => 'photo/' . $lores['resource-id'] . '-' . $lores['scale'] . '.' . $phototypes[$lores['type']] . '?f=&_u=' . Temporal::convert('now', 'UTC', 'UTC', 'ymdhis'),
 			'height' => $hires['height'],
 			'width' => $hires['width'],
 			'album' => $hires['album'],
diff --git a/mod/ping.php b/mod/ping.php
index a685a924a7..2bbe87254e 100644
--- a/mod/ping.php
+++ b/mod/ping.php
@@ -2,17 +2,19 @@
 /**
  * @file include/ping.php
  */
+
 use Friendica\App;
 use Friendica\Content\Feature;
 use Friendica\Content\ForumManager;
 use Friendica\Core\Addon;
 use Friendica\Core\Cache;
 use Friendica\Core\L10n;
-use Friendica\Core\System;
 use Friendica\Core\PConfig;
+use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Group;
+use Friendica\Util\Temporal;
 use Friendica\Util\XML;
 
 require_once 'include/datetime.php';
@@ -223,8 +225,8 @@ function ping_init(App $a)
 				WHERE `event`.`uid` = %d AND `start` < '%s' AND `finish` > '%s' and `ignore` = 0
 				ORDER BY `start` ASC ",
 				intval(local_user()),
-				dbesc(datetime_convert('UTC', 'UTC', 'now + 7 days')),
-				dbesc(datetime_convert('UTC', 'UTC', 'now'))
+				dbesc(Temporal::convert('now + 7 days')),
+				dbesc(Temporal::convert('now'))
 			);
 			if (DBM::is_result($ev)) {
 				Cache::set($cachekey, $ev, CACHE_HOUR);
@@ -235,7 +237,7 @@ function ping_init(App $a)
 			$all_events = count($ev);
 
 			if ($all_events) {
-				$str_now = datetime_convert('UTC', $a->timezone, 'now', 'Y-m-d');
+				$str_now = Temporal::convert('now', $a->timezone, 'UTC', 'Y-m-d');
 				foreach ($ev as $x) {
 					$bd = false;
 					if ($x['type'] === 'birthday') {
@@ -244,7 +246,7 @@ function ping_init(App $a)
 					} else {
 						$events ++;
 					}
-					if (datetime_convert('UTC', ((intval($x['adjust'])) ? $a->timezone : 'UTC'), $x['start'], 'Y-m-d') === $str_now) {
+					if (Temporal::convert($x['start'], ((intval($x['adjust'])) ? $a->timezone : 'UTC'), 'UTC', 'Y-m-d') === $str_now) {
 						$all_events_today ++;
 						if ($bd) {
 							$birthdays_today ++;
@@ -360,7 +362,7 @@ function ping_init(App $a)
 					$notif['photo'] = proxy_url($notif['photo'], false, PROXY_SIZE_MICRO);
 				}
 
-				$local_time = datetime_convert('UTC', date_default_timezone_get(), $notif['date']);
+				$local_time = Temporal::convert($notif['date'], date_default_timezone_get());
 
 				$notifications[] = [
 					'id'        => $notif['id'],
diff --git a/mod/profile.php b/mod/profile.php
index 5c769bdfad..e5ba22d741 100644
--- a/mod/profile.php
+++ b/mod/profile.php
@@ -2,9 +2,10 @@
 /**
  * @file mod/profile.php
  */
+
 use Friendica\App;
-use Friendica\Content\Widget;
 use Friendica\Content\Nav;
+use Friendica\Content\Widget;
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
@@ -15,6 +16,7 @@ use Friendica\Model\Group;
 use Friendica\Model\Profile;
 use Friendica\Module\Login;
 use Friendica\Protocol\DFRN;
+use Friendica\Util\Temporal;
 
 function profile_init(App $a)
 {
@@ -270,10 +272,10 @@ function profile_content(App $a, $update = 0)
 		}
 
 		if ($datequery) {
-			$sql_extra2 .= protect_sprintf(sprintf(" AND `thread`.`created` <= '%s' ", dbesc(datetime_convert(date_default_timezone_get(), '', $datequery))));
+			$sql_extra2 .= protect_sprintf(sprintf(" AND `thread`.`created` <= '%s' ", dbesc(Temporal::convert($datequery, 'UTC', date_default_timezone_get()))));
 		}
 		if ($datequery2) {
-			$sql_extra2 .= protect_sprintf(sprintf(" AND `thread`.`created` >= '%s' ", dbesc(datetime_convert(date_default_timezone_get(), '', $datequery2))));
+			$sql_extra2 .= protect_sprintf(sprintf(" AND `thread`.`created` >= '%s' ", dbesc(Temporal::convert($datequery2, 'UTC', date_default_timezone_get()))));
 		}
 
 		// Belongs the profile page to a forum?
diff --git a/mod/profile_photo.php b/mod/profile_photo.php
index 8b4d8076db..8c3c0de893 100644
--- a/mod/profile_photo.php
+++ b/mod/profile_photo.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/profile_photo.php
  */
+
 use Friendica\App;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
@@ -11,6 +12,7 @@ use Friendica\Database\DBM;
 use Friendica\Model\Photo;
 use Friendica\Model\Profile;
 use Friendica\Object\Image;
+use Friendica\Util\Temporal;
 
 function profile_photo_init(App $a)
 {
@@ -128,7 +130,7 @@ function profile_photo_post(App $a) {
 				// so that browsers will do a cache update unconditionally
 
 				$r = q("UPDATE `contact` SET `avatar-date` = '%s' WHERE `self` = 1 AND `uid` = %d",
-					dbesc(datetime_convert()),
+					dbesc(Temporal::convert()),
 					intval(local_user())
 				);
 
@@ -228,7 +230,7 @@ function profile_photo_content(App $a) {
 				);
 
 			$r = q("UPDATE `contact` SET `avatar-date` = '%s' WHERE `self` = 1 AND `uid` = %d",
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
 				intval(local_user())
 			);
 
diff --git a/mod/profiles.php b/mod/profiles.php
index 055bbf99eb..5c4a14dd6b 100644
--- a/mod/profiles.php
+++ b/mod/profiles.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/profiles.php
  */
+
 use Friendica\App;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
@@ -17,6 +18,7 @@ use Friendica\Model\GContact;
 use Friendica\Model\Profile;
 use Friendica\Model\Item;
 use Friendica\Network\Probe;
+use Friendica\Util\Temporal;
 
 function profiles_init(App $a) {
 
@@ -216,7 +218,7 @@ function profiles_post(App $a) {
 				$ignore_year = true;
 				$dob = substr($dob, 5);
 			}
-			$dob = datetime_convert('UTC', 'UTC', (($ignore_year) ? '1900-' . $dob : $dob), (($ignore_year) ? 'm-d' : 'Y-m-d'));
+			$dob = Temporal::convert((($ignore_year) ? '1900-' . $dob : $dob), 'UTC', 'UTC', (($ignore_year) ? 'm-d' : 'Y-m-d'));
 
 			if ($ignore_year) {
 				$dob = '0000-' . $dob;
@@ -250,7 +252,7 @@ function profiles_post(App $a) {
 		if (! strlen($howlong)) {
 			$howlong = NULL_DATE;
 		} else {
-			$howlong = datetime_convert(date_default_timezone_get(), 'UTC', $howlong);
+			$howlong = Temporal::convert($howlong, 'UTC', date_default_timezone_get());
 		}
 		// linkify the relationship target if applicable
 
@@ -485,7 +487,7 @@ function profiles_post(App $a) {
 		if ($namechanged && $is_default) {
 			$r = q("UPDATE `contact` SET `name` = '%s', `name-date` = '%s' WHERE `self` = 1 AND `uid` = %d",
 				dbesc($name),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
 				intval(local_user())
 			);
 			$r = q("UPDATE `user` set `username` = '%s' where `uid` = %d",
@@ -722,7 +724,7 @@ function profiles_content(App $a) {
 			'$gender' => ContactSelector::gender($r[0]['gender']),
 			'$marital' => ContactSelector::maritalStatus($r[0]['marital']),
 			'$with' => ['with', L10n::t("Who: \x28if applicable\x29"), strip_tags($r[0]['with']), L10n::t('Examples: cathy123, Cathy Williams, cathy@example.com')],
-			'$howlong' => ['howlong', L10n::t('Since [date]:'), ($r[0]['howlong'] <= NULL_DATE ? '' : datetime_convert('UTC',date_default_timezone_get(),$r[0]['howlong']))],
+			'$howlong' => ['howlong', L10n::t('Since [date]:'), ($r[0]['howlong'] <= NULL_DATE ? '' : Temporal::convert($r[0]['howlong'], date_default_timezone_get()))],
 			'$sexual' => ContactSelector::sexualPreference($r[0]['sexual']),
 			'$about' => ['about', L10n::t('Tell us about yourself...'), $r[0]['about']],
 			'$xmpp' => ['xmpp', L10n::t("XMPP \x28Jabber\x29 address:"), $r[0]['xmpp'], L10n::t("The XMPP address will be propagated to your contacts so that they can follow you.")],
diff --git a/mod/proxy.php b/mod/proxy.php
index 7efc0ffbaa..244a6cae23 100644
--- a/mod/proxy.php
+++ b/mod/proxy.php
@@ -11,6 +11,7 @@ use Friendica\Database\DBM;
 use Friendica\Model\Photo;
 use Friendica\Object\Image;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 
 define('PROXY_DEFAULT_TIME', 86400); // 1 Day
 
@@ -187,7 +188,7 @@ function proxy_init(App $a) {
 				die();
 			}
 
-			$fields = ['uid' => 0, 'contact-id' => 0, 'guid' => get_guid(), 'resource-id' => $urlhash, 'created' => datetime_convert(), 'edited' => datetime_convert(),
+			$fields = ['uid' => 0, 'contact-id' => 0, 'guid' => get_guid(), 'resource-id' => $urlhash, 'created' => Temporal::convert(), 'edited' => Temporal::convert(),
 				'filename' => basename($_REQUEST['url']), 'type' => '', 'album' => '', 'height' => imagesy($image), 'width' => imagesx($image),
 				'datasize' => 0, 'data' => $img_str, 'scale' => 100, 'profile' => 0,
 				'allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '', 'desc' => $mime];
diff --git a/mod/pubsubhubbub.php b/mod/pubsubhubbub.php
index ac85657ddf..ffab754dee 100644
--- a/mod/pubsubhubbub.php
+++ b/mod/pubsubhubbub.php
@@ -5,6 +5,7 @@ use Friendica\Core\Config;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 
 function post_var($name) {
 	return (x($_POST, $name)) ? notags(trim($_POST[$name])) : '';
@@ -138,7 +139,7 @@ function pubsubhubbub_init(App $a) {
 		  dbesc($hub_callback));
 
 		if ($subscribe) {
-			$last_update = datetime_convert('UTC','UTC','now','Y-m-d H:i:s');
+			$last_update = Temporal::convert();
 			$push_flag = 0;
 
 			// if we are just updating an old subscription, keep the
diff --git a/mod/register.php b/mod/register.php
index 6466458a7c..f0ed5cd4a5 100644
--- a/mod/register.php
+++ b/mod/register.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/register.php
  */
+
 use Friendica\App;
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
@@ -10,6 +11,7 @@ use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Model\User;
+use Friendica\Util\Temporal;
 
 require_once 'include/enotify.php';
 require_once 'include/bbcode.php';
@@ -116,7 +118,7 @@ function register_post(App $a)
 		$hash = random_string();
 		$r = q("INSERT INTO `register` ( `hash`, `created`, `uid`, `password`, `language`, `note` ) VALUES ( '%s', '%s', %d, '%s', '%s', '%s' ) ",
 			dbesc($hash),
-			dbesc(datetime_convert()),
+			dbesc(Temporal::convert()),
 			intval($user['uid']),
 			dbesc($result['password']),
 			dbesc($lang),
diff --git a/mod/settings.php b/mod/settings.php
index cb052826f4..3603008bf5 100644
--- a/mod/settings.php
+++ b/mod/settings.php
@@ -18,6 +18,7 @@ use Friendica\Model\Group;
 use Friendica\Model\User;
 use Friendica\Protocol\Email;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 
 function get_theme_config_file($theme)
 {
@@ -630,7 +631,7 @@ function settings_post(App $a)
 	if ($name_change) {
 		q("UPDATE `contact` SET `name` = '%s', `name-date` = '%s' WHERE `uid` = %d AND `self`",
 			dbesc($username),
-			dbesc(datetime_convert()),
+			dbesc(Temporal::convert()),
 			intval(local_user())
 		);
 	}
@@ -1210,7 +1211,7 @@ function settings_content(App $a)
 		'$h_basic' 	=> L10n::t('Basic Settings'),
 		'$username' => ['username',  L10n::t('Full Name:'), $username, ''],
 		'$email' 	=> ['email', L10n::t('Email Address:'), $email, '', '', '', 'email'],
-		'$timezone' => ['timezone_select' , L10n::t('Your Timezone:'), select_timezone($timezone), ''],
+		'$timezone' => ['timezone_select' , L10n::t('Your Timezone:'), Temporal::getTimezoneSelect($timezone), ''],
 		'$language' => ['language', L10n::t('Your Language:'), $language, L10n::t('Set the language we use to show you friendica interface and to send you emails'), $lang_choices],
 		'$defloc'	=> ['defloc', L10n::t('Default Post Location:'), $defloc, ''],
 		'$allowloc' => ['allow_location', L10n::t('Use Browser Location:'), ($a->user['allow_location'] == 1), ''],
diff --git a/mod/videos.php b/mod/videos.php
index ac7d0f34e5..00fa885987 100644
--- a/mod/videos.php
+++ b/mod/videos.php
@@ -2,6 +2,7 @@
 /**
  * @file mod/videos.php
  */
+
 use Friendica\App;
 use Friendica\Content\Nav;
 use Friendica\Core\Config;
@@ -13,6 +14,7 @@ use Friendica\Model\Contact;
 use Friendica\Model\Group;
 use Friendica\Model\Profile;
 use Friendica\Protocol\DFRN;
+use Friendica\Util\Temporal;
 
 require_once 'include/items.php';
 require_once 'include/acl_selectors.php';
@@ -168,8 +170,8 @@ function videos_post(App $a) {
 			//echo "<pre>"; var_dump($i); killme();
 			if (DBM::is_result($i)) {
 				q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d",
-					dbesc(datetime_convert()),
-					dbesc(datetime_convert()),
+					dbesc(Temporal::convert()),
+					dbesc(Temporal::convert()),
 					dbesc($i[0]['uri']),
 					intval(local_user())
 				);
diff --git a/mod/wall_attach.php b/mod/wall_attach.php
index 57d7b2e952..1ad435c45d 100644
--- a/mod/wall_attach.php
+++ b/mod/wall_attach.php
@@ -2,11 +2,13 @@
 /**
  * @file mod/wall_attach.php
  */
+
 use Friendica\App;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Database\DBM;
 use Friendica\Util\Mimetype;
+use Friendica\Util\Temporal;
 
 require_once 'include/datetime.php';
 
@@ -122,7 +124,7 @@ function wall_attach_post(App $a) {
 	$filedata = @file_get_contents($src);
 	$mimetype = Mimetype::getContentType($filename);
 	$hash = get_guid(64);
-	$created = datetime_convert();
+	$created = Temporal::convert();
 
 	$fields = ['uid' => $page_owner_uid, 'hash' => $hash, 'filename' => $filename, 'filetype' => $mimetype,
 		'filesize' => $filesize, 'data' => $filedata, 'created' => $created, 'edited' => $created,
diff --git a/src/Content/OEmbed.php b/src/Content/OEmbed.php
index 170ee7ba26..4ff353fa94 100644
--- a/src/Content/OEmbed.php
+++ b/src/Content/OEmbed.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * @file src/Content/OEmbed.php
  */
@@ -6,16 +7,18 @@ namespace Friendica\Content;
 
 use Friendica\Core\Addon;
 use Friendica\Core\Cache;
+use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
-use Friendica\Core\Config;
 use Friendica\Database\DBM;
 use Friendica\Util\Network;
 use Friendica\Util\ParseUrl;
+use Friendica\Util\Temporal;
 use dba;
 use DOMDocument;
-use DOMXPath;
 use DOMNode;
+use DOMText;
+use DOMXPath;
 use Exception;
 
 require_once 'include/dba.php';
@@ -110,7 +113,7 @@ class OEmbed
 						'url' => normalise_link($embedurl),
 						'maxwidth' => $a->videowidth,
 						'content' => $txt,
-						'created' => datetime_convert()
+						'created' => Temporal::convert()
 					], true);
 				}
 
diff --git a/src/Core/Cache.php b/src/Core/Cache.php
index 05ccdd4fec..c6368219a1 100644
--- a/src/Core/Cache.php
+++ b/src/Core/Cache.php
@@ -5,9 +5,10 @@
 namespace Friendica\Core;
 
 use Friendica\Core\Config;
-use Friendica\Core\PConfig;
 use Friendica\Database\DBM;
+use Friendica\Util\Temporal;
 use dba;
+use Memcache;
 
 require_once 'include/dba.php';
 
@@ -34,7 +35,7 @@ class Cache
 		$memcache_host = Config::get('system', 'memcache_host', '127.0.0.1');
 		$memcache_port = Config::get('system', 'memcache_port', 11211);
 
-		$memcache = new \Memcache;
+		$memcache = new Memcache;
 
 		if (!$memcache->connect($memcache_host, $memcache_port)) {
 			return false;
@@ -146,7 +147,7 @@ class Cache
 			$memcache->set(get_app()->get_hostname().":".$key, serialize($value), MEMCACHE_COMPRESSED, self::duration($duration));
 			return;
 		}
-		$fields = ['v' => serialize($value), 'expire_mode' => $duration, 'updated' => datetime_convert()];
+		$fields = ['v' => serialize($value), 'expire_mode' => $duration, 'updated' => Temporal::convert()];
 		$condition = ['k' => $key];
 		dba::update('cache', $fields, $condition, true);
 	}
@@ -164,21 +165,21 @@ class Cache
 		if (Config::get("system", "cache_cleared_day") < time() - self::duration(CACHE_DAY)) {
 			if ($max_level == CACHE_MONTH) {
 				$condition = ["`updated` < ? AND `expire_mode` = ?",
-						datetime_convert('UTC', 'UTC', "now - 30 days"),
+						Temporal::convert("now - 30 days"),
 						CACHE_MONTH];
 				dba::delete('cache', $condition);
 			}
 
 			if ($max_level <= CACHE_WEEK) {
 				$condition = ["`updated` < ? AND `expire_mode` = ?",
-						datetime_convert('UTC', 'UTC', "now - 7 days"),
+						Temporal::convert("now - 7 days"),
 						CACHE_WEEK];
 				dba::delete('cache', $condition);
 			}
 
 			if ($max_level <= CACHE_DAY) {
 				$condition = ["`updated` < ? AND `expire_mode` = ?",
-						datetime_convert('UTC', 'UTC', "now - 1 days"),
+						Temporal::convert("now - 1 days"),
 						CACHE_DAY];
 				dba::delete('cache', $condition);
 			}
@@ -187,7 +188,7 @@ class Cache
 
 		if (($max_level <= CACHE_HOUR) && (Config::get("system", "cache_cleared_hour")) < time() - self::duration(CACHE_HOUR)) {
 			$condition = ["`updated` < ? AND `expire_mode` = ?",
-					datetime_convert('UTC', 'UTC', "now - 1 hours"),
+					Temporal::convert("now - 1 hours"),
 					CACHE_HOUR];
 			dba::delete('cache', $condition);
 
@@ -196,7 +197,7 @@ class Cache
 
 		if (($max_level <= CACHE_HALF_HOUR) && (Config::get("system", "cache_cleared_half_hour")) < time() - self::duration(CACHE_HALF_HOUR)) {
 			$condition = ["`updated` < ? AND `expire_mode` = ?",
-					datetime_convert('UTC', 'UTC', "now - 30 minutes"),
+					Temporal::convert("now - 30 minutes"),
 					CACHE_HALF_HOUR];
 			dba::delete('cache', $condition);
 
@@ -205,7 +206,7 @@ class Cache
 
 		if (($max_level <= CACHE_QUARTER_HOUR) && (Config::get("system", "cache_cleared_quarter_hour")) < time() - self::duration(CACHE_QUARTER_HOUR)) {
 			$condition = ["`updated` < ? AND `expire_mode` = ?",
-					datetime_convert('UTC', 'UTC', "now - 15 minutes"),
+					Temporal::convert("now - 15 minutes"),
 					CACHE_QUARTER_HOUR];
 			dba::delete('cache', $condition);
 
@@ -214,7 +215,7 @@ class Cache
 
 		if (($max_level <= CACHE_FIVE_MINUTES) && (Config::get("system", "cache_cleared_five_minute")) < time() - self::duration(CACHE_FIVE_MINUTES)) {
 			$condition = ["`updated` < ? AND `expire_mode` = ?",
-					datetime_convert('UTC', 'UTC', "now - 5 minutes"),
+					Temporal::convert("now - 5 minutes"),
 					CACHE_FIVE_MINUTES];
 			dba::delete('cache', $condition);
 
@@ -223,7 +224,7 @@ class Cache
 
 		if (($max_level <= CACHE_MINUTE) && (Config::get("system", "cache_cleared_minute")) < time() - self::duration(CACHE_MINUTE)) {
 			$condition = ["`updated` < ? AND `expire_mode` = ?",
-					datetime_convert('UTC', 'UTC', "now - 1 minutes"),
+					Temporal::convert("now - 1 minutes"),
 					CACHE_MINUTE];
 			dba::delete('cache', $condition);
 
diff --git a/src/Core/NotificationsManager.php b/src/Core/NotificationsManager.php
index 7c2760a85b..8853c16d53 100644
--- a/src/Core/NotificationsManager.php
+++ b/src/Core/NotificationsManager.php
@@ -14,6 +14,7 @@ use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Profile;
 use Friendica\Util\XML;
+use Friendica\Util\Temporal;
 
 require_once 'include/dba.php';
 require_once 'include/html2plain.php';
@@ -42,7 +43,7 @@ class NotificationsManager extends BaseObject
 	{
 		$rets = [];
 		foreach ($notes as $n) {
-			$local_time = datetime_convert('UTC', date_default_timezone_get(), $n['date']);
+			$local_time = Temporal::convert($n['date'], date_default_timezone_get());
 			$n['timestamp'] = strtotime($local_time);
 			$n['date_rel'] = relative_date($n['date']);
 			$n['msg_html'] = bbcode($n['msg'], false, false, false, false);
@@ -243,7 +244,7 @@ class NotificationsManager extends BaseObject
 						$default_item_image = proxy_url($it['photo'], false, PROXY_SIZE_MICRO);
 						$default_item_url = $it['url'];
 						$default_item_text = strip_tags(bbcode($it['msg']));
-						$default_item_when = datetime_convert('UTC', date_default_timezone_get(), $it['date'], 'r');
+						$default_item_when = Temporal::convert($it['date'], date_default_timezone_get(), 'UTC', 'r');
 						$default_item_ago = relative_date($it['date']);
 						break;
 
@@ -253,7 +254,7 @@ class NotificationsManager extends BaseObject
 						$default_item_image = proxy_url($it['author-avatar'], false, PROXY_SIZE_MICRO);
 						$default_item_url = $it['author-link'];
 						$default_item_text = L10n::t("%s commented on %s's post", $it['author-name'], $it['pname']);
-						$default_item_when = datetime_convert('UTC', date_default_timezone_get(), $it['created'], 'r');
+						$default_item_when = Temporal::convert($it['created'], date_default_timezone_get(), 'UTC', 'r');
 						$default_item_ago = relative_date($it['created']);
 						break;
 
@@ -265,7 +266,7 @@ class NotificationsManager extends BaseObject
 						$default_item_text = (($it['id'] == $it['parent'])
 									? L10n::t("%s created a new post", $it['author-name'])
 									: L10n::t("%s commented on %s's post", $it['author-name'], $it['pname']));
-						$default_item_when = datetime_convert('UTC', date_default_timezone_get(), $it['created'], 'r');
+						$default_item_when = Temporal::convert($it['created'], date_default_timezone_get(), 'UTC', 'r');
 						$default_item_ago = relative_date($it['created']);
 				}
 
diff --git a/src/Core/Worker.php b/src/Core/Worker.php
index ee313bef01..cb1877dbcc 100644
--- a/src/Core/Worker.php
+++ b/src/Core/Worker.php
@@ -11,6 +11,8 @@ use Friendica\Database\DBM;
 use Friendica\Model\Process;
 use Friendica\Util\Lock;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
+
 use dba;
 
 require_once 'include/dba.php';
@@ -233,7 +235,7 @@ class Worker
 
 			if ($age > 1) {
 				$stamp = (float)microtime(true);
-				dba::update('workerqueue', ['executed' => datetime_convert()], ['pid' => $mypid, 'done' => false]);
+				dba::update('workerqueue', ['executed' => Temporal::convert()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
@@ -243,7 +245,7 @@ class Worker
 
 			$stamp = (float)microtime(true);
 			if (dba::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
-				Config::set('system', 'last_poller_execution', datetime_convert());
+				Config::set('system', 'last_poller_execution', Temporal::convert());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
 
@@ -276,7 +278,7 @@ class Worker
 
 			if ($age > 1) {
 				$stamp = (float)microtime(true);
-				dba::update('workerqueue', ['executed' => datetime_convert()], ['pid' => $mypid, 'done' => false]);
+				dba::update('workerqueue', ['executed' => Temporal::convert()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
@@ -284,7 +286,7 @@ class Worker
 
 			$stamp = (float)microtime(true);
 			if (dba::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
-				Config::set('system', 'last_poller_execution', datetime_convert());
+				Config::set('system', 'last_poller_execution', Temporal::convert());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
 		} else {
@@ -572,7 +574,7 @@ class Worker
 					}
 					dba::update(
 						'workerqueue',
-						['executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => $new_priority, 'pid' => 0],
+						['executed' => NULL_DATE, 'created' => Temporal::convert(), 'priority' => $new_priority, 'pid' => 0],
 						['id' => $entry["id"]]
 					);
 				} else {
@@ -823,7 +825,7 @@ class Worker
 		if ($found) {
 			$condition = "`id` IN (".substr(str_repeat("?, ", count($ids)), 0, -2).") AND `pid` = 0 AND NOT `done`";
 			array_unshift($ids, $condition);
-			dba::update('workerqueue', ['executed' => datetime_convert(), 'pid' => $mypid], $ids);
+			dba::update('workerqueue', ['executed' => Temporal::convert(), 'pid' => $mypid], $ids);
 		}
 
 		return $found;
@@ -951,7 +953,7 @@ class Worker
 
 		/// @todo We should clean up the corresponding workerqueue entries as well
 		$condition = ["`created` < ? AND `command` = 'worker.php'",
-				datetime_convert('UTC', 'UTC', "now - ".$timeout." minutes")];
+				Temporal::convert("now - ".$timeout." minutes")];
 		dba::delete('process', $condition);
 	}
 
@@ -1038,7 +1040,7 @@ class Worker
 
 		$priority = PRIORITY_MEDIUM;
 		$dont_fork = Config::get("system", "worker_dont_fork");
-		$created = datetime_convert();
+		$created = Temporal::convert();
 
 		if (is_int($run_parameter)) {
 			$priority = $run_parameter;
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 4f3a9ca739..c3e154d7e8 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -112,7 +112,7 @@ class Contact extends BaseObject
 
 		$return = dba::insert('contact', [
 			'uid'         => $user['uid'],
-			'created'     => datetime_convert(),
+			'created'     => Temporal::convert(),
 			'self'        => 1,
 			'name'        => $user['username'],
 			'nick'        => $user['nickname'],
@@ -129,9 +129,9 @@ class Contact extends BaseObject
 			'poll'        => System::baseUrl() . '/dfrn_poll/'    . $user['nickname'],
 			'confirm'     => System::baseUrl() . '/dfrn_confirm/' . $user['nickname'],
 			'poco'        => System::baseUrl() . '/poco/'         . $user['nickname'],
-			'name-date'   => datetime_convert(),
-			'uri-date'    => datetime_convert(),
-			'avatar-date' => datetime_convert(),
+			'name-date'   => Temporal::convert(),
+			'uri-date'    => Temporal::convert(),
+			'avatar-date' => Temporal::convert(),
 			'closeness'   => 0
 		]);
 
@@ -210,10 +210,10 @@ class Contact extends BaseObject
 		}
 
 		if ($contact['term-date'] <= NULL_DATE) {
-			dba::update('contact', ['term-date' => datetime_convert()], ['id' => $contact['id']]);
+			dba::update('contact', ['term-date' => Temporal::convert()], ['id' => $contact['id']]);
 
 			if ($contact['url'] != '') {
-				dba::update('contact', ['term-date' => datetime_convert()], ['`nurl` = ? AND `term-date` <= ? AND NOT `self`', normalise_link($contact['url']), NULL_DATE]);
+				dba::update('contact', ['term-date' => Temporal::convert()], ['`nurl` = ? AND `term-date` <= ? AND NOT `self`', normalise_link($contact['url']), NULL_DATE]);
 			}
 		} else {
 			/* @todo
@@ -224,7 +224,7 @@ class Contact extends BaseObject
 
 			/// @todo Check for contact vitality via probing
 			$expiry = $contact['term-date'] . ' + 32 days ';
-			if (datetime_convert() > datetime_convert('UTC', 'UTC', $expiry)) {
+			if (Temporal::convert() > Temporal::convert($expiry)) {
 				/* Relationship is really truly dead. archive them rather than
 				 * delete, though if the owner tries to unarchive them we'll start
 				 * the whole process over again.
@@ -688,7 +688,7 @@ class Contact extends BaseObject
 			$contact_id = $contact["id"];
 
 			// Update the contact every 7 days
-			$update_contact = ($contact['avatar-date'] < datetime_convert('', '', 'now -7 days'));
+			$update_contact = ($contact['avatar-date'] < Temporal::convert('now -7 days'));
 
 			// We force the update if the avatar is empty
 			if (!x($contact, 'avatar')) {
@@ -728,7 +728,7 @@ class Contact extends BaseObject
 		if (!$contact_id) {
 			dba::insert('contact', [
 				'uid'       => $uid,
-				'created'   => datetime_convert(),
+				'created'   => Temporal::convert(),
 				'url'       => $data["url"],
 				'nurl'      => normalise_link($data["url"]),
 				'addr'      => $data["addr"],
@@ -749,9 +749,9 @@ class Contact extends BaseObject
 				'request'   => $data["request"],
 				'confirm'   => $data["confirm"],
 				'poco'      => $data["poco"],
-				'name-date' => datetime_convert(),
-				'uri-date'  => datetime_convert(),
-				'avatar-date' => datetime_convert(),
+				'name-date' => Temporal::convert(),
+				'uri-date'  => Temporal::convert(),
+				'avatar-date' => Temporal::convert(),
 				'writable'  => 1,
 				'blocked'   => 0,
 				'readonly'  => 0,
@@ -823,13 +823,13 @@ class Contact extends BaseObject
 		}
 
 		if (($data["addr"] != $contact["addr"]) || ($data["alias"] != $contact["alias"])) {
-			$updated['uri-date'] = datetime_convert();
+			$updated['uri-date'] = Temporal::convert();
 		}
 		if (($data["name"] != $contact["name"]) || ($data["nick"] != $contact["nick"])) {
-			$updated['name-date'] = datetime_convert();
+			$updated['name-date'] = Temporal::convert();
 		}
 
-		$updated['avatar-date'] = datetime_convert();
+		$updated['avatar-date'] = Temporal::convert();
 
 		dba::update('contact', $updated, ['id' => $contact_id], $contact);
 
@@ -1026,7 +1026,7 @@ class Contact extends BaseObject
 			if ($photos) {
 				dba::update(
 					'contact',
-					['avatar' => $avatar, 'photo' => $photos[0], 'thumb' => $photos[1], 'micro' => $photos[2], 'avatar-date' => datetime_convert()],
+					['avatar' => $avatar, 'photo' => $photos[0], 'thumb' => $photos[1], 'micro' => $photos[2], 'avatar-date' => Temporal::convert()],
 					['id' => $cid]
 				);
 
@@ -1261,7 +1261,7 @@ class Contact extends BaseObject
 			// create contact record
 			dba::insert('contact', [
 				'uid'     => $uid,
-				'created' => datetime_convert(),
+				'created' => Temporal::convert(),
 				'url'     => $ret['url'],
 				'nurl'    => normalise_link($ret['url']),
 				'addr'    => $ret['addr'],
diff --git a/src/Model/GContact.php b/src/Model/GContact.php
index 0d0969ca0c..1e0adac494 100644
--- a/src/Model/GContact.php
+++ b/src/Model/GContact.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * @file src/Model/GlobalContact.php
  * @brief This file includes the GlobalContact class with directory related functions
@@ -14,6 +15,7 @@ use Friendica\Model\Profile;
 use Friendica\Network\Probe;
 use Friendica\Protocol\PortableContact;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use dba;
 use Exception;
 
@@ -118,12 +120,12 @@ class GContact
 				intval($uid),
 				intval($gcid),
 				intval($zcid),
-				dbesc(datetime_convert())
+				dbesc(Temporal::convert())
 			);
 		} else {
 			q(
 				"UPDATE `glink` SET `updated` = '%s' WHERE `cid` = %d AND `uid` = %d AND `gcid` = %d AND `zcid` = %d",
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
 				intval($cid),
 				intval($uid),
 				intval($gcid),
@@ -715,8 +717,8 @@ class GContact
 				dbesc($contact["url"]),
 				dbesc(normalise_link($contact["url"])),
 				dbesc($contact["photo"]),
-				dbesc(datetime_convert()),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
+				dbesc(Temporal::convert()),
 				dbesc($contact["location"]),
 				dbesc($contact["about"]),
 				intval($contact["hide"]),
@@ -1048,7 +1050,7 @@ class GContact
 
 		foreach ($r as $server) {
 			self::fetchGsUsers($server["url"]);
-			q("UPDATE `gserver` SET `last_poco_query` = '%s' WHERE `nurl` = '%s'", dbesc(datetime_convert()), dbesc($server["nurl"]));
+			q("UPDATE `gserver` SET `last_poco_query` = '%s' WHERE `nurl` = '%s'", dbesc(Temporal::convert()), dbesc($server["nurl"]));
 		}
 	}
 
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 7545375181..8628ac42d9 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -22,6 +22,7 @@ use Friendica\Model\Term;
 use Friendica\Object\Image;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\OStatus;
+use Friendica\Util\Temporal;
 use dba;
 use Text_LanguageDetect;
 
@@ -148,7 +149,7 @@ class Item extends BaseObject
 
 		// Set the item to "deleted"
 		dba::update('item', ['deleted' => true, 'title' => '', 'body' => '',
-					'edited' => datetime_convert(), 'changed' => datetime_convert()],
+					'edited' => Temporal::convert(), 'changed' => Temporal::convert()],
 				['id' => $item['id']]);
 
 		create_tags_from_item($item['id']);
@@ -300,11 +301,11 @@ class Item extends BaseObject
 		$arr['owner-name']    = trim(defaults($arr, 'owner-name', ''));
 		$arr['owner-link']    = trim(defaults($arr, 'owner-link', ''));
 		$arr['owner-avatar']  = trim(defaults($arr, 'owner-avatar', ''));
-		$arr['received']      = ((x($arr, 'received') !== false) ? datetime_convert('UTC','UTC', $arr['received']) : datetime_convert());
-		$arr['created']       = ((x($arr, 'created') !== false) ? datetime_convert('UTC','UTC', $arr['created']) : $arr['received']);
-		$arr['edited']        = ((x($arr, 'edited') !== false) ? datetime_convert('UTC','UTC', $arr['edited']) : $arr['created']);
-		$arr['changed']       = ((x($arr, 'changed') !== false) ? datetime_convert('UTC','UTC', $arr['changed']) : $arr['created']);
-		$arr['commented']     = ((x($arr, 'commented') !== false) ? datetime_convert('UTC','UTC', $arr['commented']) : $arr['created']);
+		$arr['received']      = ((x($arr, 'received') !== false) ? Temporal::convert($arr['received']) : Temporal::convert());
+		$arr['created']       = ((x($arr, 'created') !== false) ? Temporal::convert($arr['created']) : $arr['received']);
+		$arr['edited']        = ((x($arr, 'edited') !== false) ? Temporal::convert($arr['edited']) : $arr['created']);
+		$arr['changed']       = ((x($arr, 'changed') !== false) ? Temporal::convert($arr['changed']) : $arr['created']);
+		$arr['commented']     = ((x($arr, 'commented') !== false) ? Temporal::convert($arr['commented']) : $arr['created']);
 		$arr['title']         = trim(defaults($arr, 'title', ''));
 		$arr['location']      = trim(defaults($arr, 'location', ''));
 		$arr['coord']         = trim(defaults($arr, 'coord', ''));
@@ -340,13 +341,13 @@ class Item extends BaseObject
 		}
 
 		// Items cannot be stored before they happen ...
-		if ($arr['created'] > datetime_convert()) {
-			$arr['created'] = datetime_convert();
+		if ($arr['created'] > Temporal::convert()) {
+			$arr['created'] = Temporal::convert();
 		}
 
 		// We haven't invented time travel by now.
-		if ($arr['edited'] > datetime_convert()) {
-			$arr['edited'] = datetime_convert();
+		if ($arr['edited'] > Temporal::convert()) {
+			$arr['edited'] = Temporal::convert();
 		}
 
 		if (($arr['author-link'] == "") && ($arr['owner-link'] == "")) {
@@ -740,9 +741,9 @@ class Item extends BaseObject
 		// update the commented timestamp on the parent
 		// Only update "commented" if it is really a comment
 		if (($arr['verb'] == ACTIVITY_POST) || !Config::get("system", "like_no_comment")) {
-			dba::update('item', ['commented' => datetime_convert(), 'changed' => datetime_convert()], ['id' => $parent_id]);
+			dba::update('item', ['commented' => Temporal::convert(), 'changed' => Temporal::convert()], ['id' => $parent_id]);
 		} else {
-			dba::update('item', ['changed' => datetime_convert()], ['id' => $parent_id]);
+			dba::update('item', ['changed' => Temporal::convert()], ['id' => $parent_id]);
 		}
 
 		if ($dsprsig) {
@@ -1642,7 +1643,7 @@ class Item extends BaseObject
 			intval($wall ? 1 : 0)
 		);
 		if (DBM::is_result($r)) {
-			return substr(datetime_convert('',date_default_timezone_get(), $r[0]['created']),0,10);
+			return substr(Temporal::convert($r[0]['created'], date_default_timezone_get()),0,10);
 		}
 		return false;
 	}
diff --git a/src/Model/Mail.php b/src/Model/Mail.php
index be68f515f1..701cf3ad95 100644
--- a/src/Model/Mail.php
+++ b/src/Model/Mail.php
@@ -1,14 +1,16 @@
 <?php
+
 /**
  * @file src/Model/Mail.php
  */
 namespace Friendica\Model;
 
-use Friendica\App;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
+use Friendica\Network\Probe;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -80,7 +82,7 @@ class Mail
 			$handles = $recip_handle . ';' . $sender_handle;
 
 			$fields = ['uid' => local_user(), 'guid' => $conv_guid, 'creator' => $sender_handle,
-				'created' => datetime_convert(), 'updated' => datetime_convert(),
+				'created' => Temporal::convert(), 'updated' => Temporal::convert(),
 				'subject' => $subject, 'recips' => $handles];
 			if (dba::insert('conv', $fields)) {
 				$convid = dba::lastInsertId();
@@ -114,7 +116,7 @@ class Mail
 				'replied' => 0,
 				'uri' => $uri,
 				'parent-uri' => $replyto,
-				'created' => datetime_convert()
+				'created' => Temporal::convert()
 			]
 		);
 
@@ -194,12 +196,12 @@ class Mail
 
 		$convid = null;
 		$fields = ['uid' => $recipient['uid'], 'guid' => $conv_guid, 'creator' => $sender_handle,
-			'created' => datetime_convert(), 'updated' => datetime_convert(),
+			'created' => Temporal::convert(), 'updated' => Temporal::convert(),
 			'subject' => $subject, 'recips' => $handles];
 		if (dba::insert('conv', $fields)) {
 			$convid = dba::lastInsertId();
 		}
-		
+
 		if (!$convid) {
 			logger('send message: conversation not found.');
 			return -4;
@@ -222,7 +224,7 @@ class Mail
 				'replied' => 0,
 				'uri' => $uri,
 				'parent-uri' => $replyto,
-				'created' => datetime_convert(),
+				'created' => Temporal::convert(),
 				'unknown' => 1
 			]
 		);
diff --git a/src/Model/Photo.php b/src/Model/Photo.php
index fc6e60a9ce..a2c69f994c 100644
--- a/src/Model/Photo.php
+++ b/src/Model/Photo.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * @file src/Model/Photo.php
  * @brief This file contains the Photo class for database interface
@@ -8,11 +9,11 @@ namespace Friendica\Model;
 use Friendica\Core\Cache;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
-use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Object\Image;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -54,8 +55,8 @@ class Photo
 			'contact-id' => $cid,
 			'guid' => $guid,
 			'resource-id' => $rid,
-			'created' => datetime_convert(),
-			'edited' => datetime_convert(),
+			'created' => Temporal::convert(),
+			'edited' => Temporal::convert(),
 			'filename' => basename($filename),
 			'type' => $Image->getType(),
 			'album' => $album,
diff --git a/src/Model/Process.php b/src/Model/Process.php
index 8b7ce8d34a..99d5af543b 100644
--- a/src/Model/Process.php
+++ b/src/Model/Process.php
@@ -5,6 +5,7 @@
 namespace Friendica\Model;
 
 use Friendica\BaseObject;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -33,7 +34,7 @@ class Process extends BaseObject
 		dba::transaction();
 
 		if (!dba::exists('process', ['pid' => $pid])) {
-			$return = dba::insert('process', ['pid' => $pid, 'command' => $command, 'created' => datetime_convert()]);
+			$return = dba::insert('process', ['pid' => $pid, 'command' => $command, 'created' => Temporal::convert()]);
 		}
 
 		dba::commit();
diff --git a/src/Model/Profile.php b/src/Model/Profile.php
index df53b5d80a..665945032a 100644
--- a/src/Model/Profile.php
+++ b/src/Model/Profile.php
@@ -18,6 +18,7 @@ use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Protocol\Diaspora;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -555,8 +556,8 @@ class Profile
 				WHERE `event`.`uid` = ? AND `type` = 'birthday' AND `start` < ? AND `finish` > ?
 				ORDER BY `start` ASC ",
 				local_user(),
-				datetime_convert('UTC', 'UTC', 'now + 6 days'),
-				datetime_convert('UTC', 'UTC', 'now')
+				Temporal::convert('now + 6 days'),
+				Temporal::convert('now')
 			);
 			if (DBM::is_result($s)) {
 				$r = dba::inArray($s);
@@ -599,7 +600,7 @@ class Profile
 
 					$rr['link'] = $url;
 					$rr['title'] = $rr['name'];
-					$rr['date'] = day_translate(datetime_convert('UTC', $a->timezone, $rr['start'], $rr['adjust'] ? $bd_format : $bd_short)) . (($today) ? ' ' . L10n::t('[today]') : '');
+					$rr['date'] = day_translate(Temporal::convert($rr['start'], $a->timezone, 'UTC', $rr['adjust'] ? $bd_format : $bd_short)) . (($today) ? ' ' . L10n::t('[today]') : '');
 					$rr['startime'] = null;
 					$rr['today'] = $today;
 				}
@@ -643,8 +644,8 @@ class Profile
 			WHERE `event`.`uid` = ? AND `type` != 'birthday' AND `start` < ? AND `start` >= ?
 			ORDER BY `start` ASC ",
 			local_user(),
-			datetime_convert('UTC', 'UTC', 'now + 7 days'),
-			datetime_convert('UTC', 'UTC', 'now - 1 days')
+			Temporal::convert('now + 7 days'),
+			Temporal::convert('now - 1 days')
 		);
 
 		$r = [];
@@ -657,8 +658,8 @@ class Profile
 					$total ++;
 				}
 
-				$strt = datetime_convert('UTC', $rr['convert'] ? $a->timezone : 'UTC', $rr['start'], 'Y-m-d');
-				if ($strt === datetime_convert('UTC', $a->timezone, 'now', 'Y-m-d')) {
+				$strt = Temporal::convert($rr['start'], $rr['convert'] ? $a->timezone : 'UTC', 'UTC', 'Y-m-d');
+				if ($strt === Temporal::convert('now', $a->timezone, 'UTC', 'Y-m-d')) {
 					$istoday = true;
 				}
 
@@ -673,17 +674,17 @@ class Profile
 					$description = L10n::t('[No description]');
 				}
 
-				$strt = datetime_convert('UTC', $rr['convert'] ? $a->timezone : 'UTC', $rr['start']);
+				$strt = Temporal::convert($rr['start'], $rr['convert'] ? $a->timezone : 'UTC');
 
-				if (substr($strt, 0, 10) < datetime_convert('UTC', $a->timezone, 'now', 'Y-m-d')) {
+				if (substr($strt, 0, 10) < Temporal::convert('now', $a->timezone, 'UTC', 'Y-m-d')) {
 					continue;
 				}
 
-				$today = ((substr($strt, 0, 10) === datetime_convert('UTC', $a->timezone, 'now', 'Y-m-d')) ? true : false);
+				$today = ((substr($strt, 0, 10) === Temporal::convert('now', $a->timezone, 'UTC', 'Y-m-d')) ? true : false);
 
 				$rr['title'] = $title;
 				$rr['description'] = $description;
-				$rr['date'] = day_translate(datetime_convert('UTC', $rr['adjust'] ? $a->timezone : 'UTC', $rr['start'], $bd_format)) . (($today) ? ' ' . L10n::t('[today]') : '');
+				$rr['date'] = day_translate(Temporal::convert($rr['start'], $rr['adjust'] ? $a->timezone : 'UTC', 'UTC', $bd_format)) . (($today) ? ' ' . L10n::t('[today]') : '');
 				$rr['startime'] = $strt;
 				$rr['today'] = $today;
 
@@ -729,8 +730,8 @@ class Profile
 				$short_bd_format = L10n::t('j F');
 
 				$val = intval($a->profile['dob']) ?
-					day_translate(datetime_convert('UTC', 'UTC', $a->profile['dob'] . ' 00:00 +00:00', $year_bd_format))
-					: day_translate(datetime_convert('UTC', 'UTC', '2001-' . substr($a->profile['dob'], 5) . ' 00:00 +00:00', $short_bd_format));
+					day_translate(Temporal::convert($a->profile['dob'] . ' 00:00 +00:00', 'UTC', 'UTC', $year_bd_format))
+					: day_translate(Temporal::convert('2001-' . substr($a->profile['dob'], 'UTC', 'UTC', 5) . ' 00:00 +00:00', $short_bd_format));
 
 				$profile['birthday'] = [L10n::t('Birthday:'), $val];
 			}
diff --git a/src/Model/Queue.php b/src/Model/Queue.php
index 3c262ddb08..99ba6385c1 100644
--- a/src/Model/Queue.php
+++ b/src/Model/Queue.php
@@ -6,6 +6,7 @@ namespace Friendica\Model;
 
 use Friendica\Core\Config;
 use Friendica\Database\DBM;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -19,9 +20,9 @@ class Queue
 	public static function updateTime($id)
 	{
 		logger('queue: requeue item ' . $id);
-		dba::update('queue', ['last' => datetime_convert()], ['id' => $id]);
+		dba::update('queue', ['last' => Temporal::convert()], ['id' => $id]);
 	}
-	
+
 	/**
 	 * @param string $id id
 	 */
@@ -30,7 +31,7 @@ class Queue
 		logger('queue: remove queue item ' . $id);
 		dba::delete('queue', ['id' => $id]);
 	}
-	
+
 	/**
 	 * @brief Checks if the communication with a given contact had problems recently
 	 *
@@ -45,9 +46,9 @@ class Queue
 			AND `last` > UTC_TIMESTAMP() - INTERVAL 15 MINUTE LIMIT 1",
 			intval($cid)
 		);
-	
+
 		$was_delayed = DBM::is_result($r);
-	
+
 		// We set "term-date" to a current date if the communication has problems.
 		// If the communication works again we reset this value.
 		if ($was_delayed) {
@@ -56,10 +57,10 @@ class Queue
 			);
 			$was_delayed = !DBM::is_result($r);
 		}
-	
+
 		return $was_delayed;
 	}
-	
+
 	/**
 	 * @param string  $cid     cid
 	 * @param string  $network network
@@ -68,17 +69,17 @@ class Queue
 	 */
 	public static function add($cid, $network, $msg, $batch = false)
 	{
-	
+
 		$max_queue = Config::get('system', 'max_contact_queue');
 		if ($max_queue < 1) {
 			$max_queue = 500;
 		}
-	
+
 		$batch_queue = Config::get('system', 'max_batch_queue');
 		if ($batch_queue < 1) {
 			$batch_queue = 1000;
 		}
-	
+
 		$r = q("SELECT COUNT(*) AS `total` FROM `queue` INNER JOIN `contact` ON `queue`.`cid` = `contact`.`id`
 			WHERE `queue`.`cid` = %d AND `contact`.`self` = 0 ",
 			intval($cid)
@@ -93,7 +94,7 @@ class Queue
 				return;
 			}
 		}
-	
-		dba::insert('queue', ['cid' => $cid, 'network' => $network, 'created' => datetime_convert(), 'last' => datetime_convert(), 'content' => $msg, 'batch' =>($batch) ? 1 : 0]);
+
+		dba::insert('queue', ['cid' => $cid, 'network' => $network, 'created' => Temporal::convert(), 'last' => Temporal::convert(), 'content' => $msg, 'batch' =>($batch) ? 1 : 0]);
 	}
 }
diff --git a/src/Model/User.php b/src/Model/User.php
index c8409b5843..618c5988f1 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -7,8 +7,8 @@ namespace Friendica\Model;
 
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
-use Friendica\Core\PConfig;
 use Friendica\Core\L10n;
+use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
@@ -18,8 +18,10 @@ use Friendica\Model\Photo;
 use Friendica\Object\Image;
 use Friendica\Util\Crypto;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use dba;
 use Exception;
+use LightOpenID;
 
 require_once 'boot.php';
 require_once 'include/dba.php';
@@ -286,7 +288,7 @@ class User
 				$_SESSION['register'] = 1;
 				$_SESSION['openid'] = $openid_url;
 
-				$openid = new \LightOpenID;
+				$openid = new LightOpenID;
 				$openid->identity = $openid_url;
 				$openid->returnUrl = System::baseUrl() . '/openid';
 				$openid->required = ['namePerson/friendly', 'contact/email', 'namePerson'];
@@ -394,7 +396,7 @@ class User
 			'verified' => $verified,
 			'blocked'  => $blocked,
 			'timezone' => 'UTC',
-			'register_date' => datetime_convert(),
+			'register_date' => Temporal::convert(),
 			'default-location' => ''
 		]);
 
@@ -611,7 +613,7 @@ class User
 		dba::insert('userd', ['username' => $user['nickname']]);
 
 		// The user and related data will be deleted in "cron_expire_and_remove_users" (cronjobs.php)
-		dba::update('user', ['account_removed' => true, 'account_expires_on' => datetime_convert()], ['uid' => $uid]);
+		dba::update('user', ['account_removed' => true, 'account_expires_on' => Temporal::convert()], ['uid' => $uid]);
 		Worker::add(PRIORITY_HIGH, "Notifier", "removeme", $uid);
 
 		// Send an update to the directory
diff --git a/src/Module/Login.php b/src/Module/Login.php
index ae7277329d..790fc3de8e 100644
--- a/src/Module/Login.php
+++ b/src/Module/Login.php
@@ -11,7 +11,10 @@ use Friendica\Core\L10n;
 use Friendica\Database\DBM;
 use Friendica\Model\User;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use dba;
+use Exception;
+use LightOpenID;
 
 require_once 'boot.php';
 require_once 'include/datetime.php';
@@ -68,7 +71,7 @@ class Login extends BaseModule
 
 			// Otherwise it's probably an openid.
 			try {
-				$openid = new \LightOpenID;
+				$openid = new LightOpenID;
 				$openid->identity = $openid_url;
 				$_SESSION['openid'] = $openid_url;
 				$_SESSION['remember'] = $_POST['remember'];
@@ -118,7 +121,7 @@ class Login extends BaseModule
 
 			// if we haven't failed up this point, log them in.
 			$_SESSION['remember'] = $_POST['remember'];
-			$_SESSION['last_login_date'] = datetime_convert('UTC', 'UTC');
+			$_SESSION['last_login_date'] = Temporal::convert();
 			authenticate_success($record, true, true);
 
 			if (x($_SESSION, 'return_url')) {
@@ -217,10 +220,10 @@ class Login extends BaseModule
 				// stays logged in for a long time, e.g. with "Remember Me"
 				$login_refresh = false;
 				if (!x($_SESSION['last_login_date'])) {
-					$_SESSION['last_login_date'] = datetime_convert('UTC', 'UTC');
+					$_SESSION['last_login_date'] = Temporal::convert();
 				}
-				if (strcmp(datetime_convert('UTC', 'UTC', 'now - 12 hours'), $_SESSION['last_login_date']) > 0) {
-					$_SESSION['last_login_date'] = datetime_convert('UTC', 'UTC');
+				if (strcmp(Temporal::convert('now - 12 hours'), $_SESSION['last_login_date']) > 0) {
+					$_SESSION['last_login_date'] = Temporal::convert();
 					$login_refresh = true;
 				}
 				authenticate_success($user, false, false, $login_refresh);
diff --git a/src/Network/FKOAuth1.php b/src/Network/FKOAuth1.php
index 5efa5f2432..7c8f56a64a 100644
--- a/src/Network/FKOAuth1.php
+++ b/src/Network/FKOAuth1.php
@@ -9,6 +9,7 @@ use Friendica\Core\PConfig;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Network\FKOAuthDataStore;
+use Friendica\Util\Temporal;
 use dba;
 use OAuthServer;
 use OAuthSignatureMethod_HMAC_SHA1;
@@ -67,7 +68,7 @@ class FKOAuth1 extends OAuthServer
 			$_SESSION['cid'] = $a->cid;
 		}
 
-		dba::update('user', ['login_date' => datetime_convert()], ['uid' => $_SESSION['uid']]);
+		dba::update('user', ['login_date' => Temporal::convert()], ['uid' => $_SESSION['uid']]);
 
 		Addon::callHooks('logged_in', $a->user);
 	}
diff --git a/src/Object/Post.php b/src/Object/Post.php
index 67ce3b7cce..4797850a48 100644
--- a/src/Object/Post.php
+++ b/src/Object/Post.php
@@ -13,6 +13,7 @@ use Friendica\Core\PConfig;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Profile;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -123,7 +124,7 @@ class Post extends BaseObject
 		if (strtotime($item['edited']) - strtotime($item['created']) > 1) {
 			$edited = [
 				'label'    => L10n::t('This entry was edited'),
-				'date'     => datetime_convert('UTC', date_default_timezone_get(), $item['edited'], 'r'),
+				'date'     => Temporal::convert($item['edited'], date_default_timezone_get(), 'UTC', 'r'),
 				'relative' => relative_date($item['edited'])
 			];
 		}
@@ -300,7 +301,7 @@ class Post extends BaseObject
 
 		$comment = $this->getCommentBox($indent);
 
-		if (strcmp(datetime_convert('UTC', 'UTC', $item['created']), datetime_convert('UTC', 'UTC', 'now - 12 hours')) > 0) {
+		if (strcmp(Temporal::convert($item['created']), Temporal::convert('now - 12 hours')) > 0) {
 			$shiny = 'shiny';
 		}
 
@@ -363,7 +364,7 @@ class Post extends BaseObject
 			'osparkle'        => $osparkle,
 			'sparkle'         => $sparkle,
 			'title'           => $title_e,
-			'localtime'       => datetime_convert('UTC', date_default_timezone_get(), $item['created'], 'r'),
+			'localtime'       => Temporal::convert($item['created'], date_default_timezone_get(), 'UTC', 'r'),
 			'ago'             => $item['app'] ? L10n::t('%s from %s', relative_date($item['created']), $item['app']) : relative_date($item['created']),
 			'app'             => $item['app'],
 			'created'         => relative_date($item['created']),
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index 6a83981371..871358d988 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -27,6 +27,7 @@ use Friendica\Object\Image;
 use Friendica\Protocol\OStatus;
 use Friendica\Util\Crypto;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use Friendica\Util\XML;
 use Friendica\Content\Text\BBCode;
 
@@ -228,7 +229,7 @@ class DFRN
 			}
 		}
 
-		$check_date = datetime_convert('UTC', 'UTC', $last_update, 'Y-m-d H:i:s');
+		$check_date = Temporal::convert($last_update);
 
 		$r = q(
 			"SELECT `item`.*, `item`.`id` AS `item_id`,
@@ -420,7 +421,7 @@ class DFRN
 
 		XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 		XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
-		XML::addElement($doc, $mail, "dfrn:sentdate", datetime_convert('UTC', 'UTC', $item['created'] . '+00:00', ATOM_TIME));
+		XML::addElement($doc, $mail, "dfrn:sentdate", Temporal::convert($item['created'] . '+00:00', 'UTC', 'UTC', ATOM_TIME));
 		XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 		XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 
@@ -586,7 +587,7 @@ class DFRN
 
 		/// @todo We need a way to transmit the different page flags like "PAGE_PRVGROUP"
 
-		XML::addElement($doc, $root, "updated", datetime_convert("UTC", "UTC", "now", ATOM_TIME));
+		XML::addElement($doc, $root, "updated", Temporal::convert("now", "UTC", "UTC", ATOM_TIME));
 
 		$author = self::addAuthor($doc, $owner, $authorelement, $public);
 		$root->appendChild($author);
@@ -621,9 +622,9 @@ class DFRN
 
 		$author = $doc->createElement($authorelement);
 
-		$namdate = datetime_convert('UTC', 'UTC', $owner['name-date'].'+00:00', ATOM_TIME);
-		$uridate = datetime_convert('UTC', 'UTC', $owner['uri-date'].'+00:00', ATOM_TIME);
-		$picdate = datetime_convert('UTC', 'UTC', $owner['avatar-date'].'+00:00', ATOM_TIME);
+		$namdate = Temporal::convert($owner['name-date'].'+00:00', 'UTC', 'UTC', ATOM_TIME);
+		$uridate = Temporal::convert($owner['uri-date'].'+00:00', 'UTC', 'UTC', ATOM_TIME);
+		$picdate = Temporal::convert($owner['avatar-date'].'+00:00', 'UTC', 'UTC', ATOM_TIME);
 
 		$attributes = [];
 
@@ -902,7 +903,7 @@ class DFRN
 		}
 
 		if ($item['deleted']) {
-			$attributes = ["ref" => $item['uri'], "when" => datetime_convert('UTC', 'UTC', $item['edited'] . '+00:00', ATOM_TIME)];
+			$attributes = ["ref" => $item['uri'], "when" => Temporal::convert($item['edited'] . '+00:00', 'UTC', 'UTC', ATOM_TIME)];
 			return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 		}
 
@@ -982,8 +983,8 @@ class DFRN
 		XML::addElement($doc, $entry, "id", $item["uri"]);
 		XML::addElement($doc, $entry, "title", $item["title"]);
 
-		XML::addElement($doc, $entry, "published", datetime_convert("UTC", "UTC", $item["created"] . "+00:00", ATOM_TIME));
-		XML::addElement($doc, $entry, "updated", datetime_convert("UTC", "UTC", $item["edited"] . "+00:00", ATOM_TIME));
+		XML::addElement($doc, $entry, "published", Temporal::convert($item["created"] . "+00:00", "UTC", "UTC", ATOM_TIME));
+		XML::addElement($doc, $entry, "updated", Temporal::convert($item["edited"] . "+00:00", "UTC", "UTC", ATOM_TIME));
 
 		// "dfrn:env" is used to read the content
 		XML::addElement($doc, $entry, "dfrn:env", base64url_encode($body, true));
@@ -1387,7 +1388,7 @@ class DFRN
 			"SELECT `id` FROM `event` WHERE `uid` = %d AND `cid` = %d AND `start` = '%s' AND `type` = '%s' LIMIT 1",
 			intval($contact["uid"]),
 			intval($contact["id"]),
-			dbesc(datetime_convert("UTC", "UTC", $birthday)),
+			dbesc(Temporal::convert($birthday)),
 			dbesc("birthday")
 		);
 
@@ -1405,10 +1406,10 @@ class DFRN
 			VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s') ",
 			intval($contact["uid"]),
 			intval($contact["id"]),
-			dbesc(datetime_convert()),
-			dbesc(datetime_convert()),
-			dbesc(datetime_convert("UTC", "UTC", $birthday)),
-			dbesc(datetime_convert("UTC", "UTC", $birthday . " + 1 day ")),
+			dbesc(Temporal::convert()),
+			dbesc(Temporal::convert()),
+			dbesc(Temporal::convert($birthday)),
+			dbesc(Temporal::convert($birthday . " + 1 day ")),
 			dbesc($bdtext),
 			dbesc($bdtext2),
 			dbesc("birthday")
@@ -1888,7 +1889,7 @@ class DFRN
 			intval($suggest["cid"]),
 			dbesc($suggest["body"]),
 			dbesc($hash),
-			dbesc(datetime_convert()),
+			dbesc(Temporal::convert()),
 			intval(0)
 		);
 
@@ -2080,13 +2081,13 @@ class DFRN
 
 		if (self::isEditedTimestampNewer($current, $item)) {
 			// do not accept (ignore) an earlier edit than one we currently have.
-			if (datetime_convert("UTC", "UTC", $item["edited"]) < $current["edited"]) {
+			if (Temporal::convert($item["edited"]) < $current["edited"]) {
 				return false;
 			}
 
 			$fields = ['title' => $item["title"], 'body' => $item["body"],
-					'tag' => $item["tag"], 'changed' => datetime_convert(),
-					'edited' => datetime_convert("UTC", "UTC", $item["edited"])];
+					'tag' => $item["tag"], 'changed' => Temporal::convert(),
+					'edited' => Temporal::convert($item["edited"])];
 
 			$condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
 			dba::update('item', $fields, $condition);
@@ -2421,7 +2422,7 @@ class DFRN
 
 		// Is there an existing item?
 		if (DBM::is_result($current) && self::isEditedTimestampNewer($current[0], $item)
-			&& (datetime_convert("UTC", "UTC", $item["edited"]) < $current[0]["edited"])
+			&& (Temporal::convert($item["edited"]) < $current[0]["edited"])
 		) {
 			logger("Item ".$item["uri"]." already existed.", LOGGER_DEBUG);
 			return;
@@ -2752,9 +2753,9 @@ class DFRN
 			}
 		}
 		if ($when) {
-			$when = datetime_convert("UTC", "UTC", $when, "Y-m-d H:i:s");
+			$when = Temporal::convert($when);
 		} else {
-			$when = datetime_convert("UTC", "UTC", "now", "Y-m-d H:i:s");
+			$when = Temporal::convert("now");
 		}
 
 		if (!$uri || !$importer["id"]) {
@@ -2835,7 +2836,7 @@ class DFRN
 						`body` = '', `title` = ''
 					WHERE `parent-uri` = '%s' AND `uid` IN (0, %d)",
 					dbesc($when),
-					dbesc(datetime_convert()),
+					dbesc(Temporal::convert()),
 					dbesc($uri),
 					intval($importer["uid"])
 				);
@@ -2848,7 +2849,7 @@ class DFRN
 						`body` = '', `title` = ''
 					WHERE `uri` = '%s' AND `uid` IN (0, %d)",
 					dbesc($when),
-					dbesc(datetime_convert()),
+					dbesc(Temporal::convert()),
 					dbesc($uri),
 					intval($importer["uid"])
 				);
@@ -3156,8 +3157,8 @@ class DFRN
 			return false;
 		}
 
-		$existing_edited = datetime_convert('UTC', 'UTC', $existing['edited']);
-		$update_edited = datetime_convert('UTC', 'UTC', $update['edited']);
+		$existing_edited = Temporal::convert($existing['edited']);
+		$update_edited = Temporal::convert($update['edited']);
 
 		return (strcmp($existing_edited, $update_edited) < 0);
 	}
diff --git a/src/Protocol/Diaspora.php b/src/Protocol/Diaspora.php
index c05db2eb1f..c7f8bec027 100644
--- a/src/Protocol/Diaspora.php
+++ b/src/Protocol/Diaspora.php
@@ -76,7 +76,7 @@ class Diaspora
 				$r = q(
 					"INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
 					VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
-					datetime_convert(),
+					Temporal::convert(),
 					dbesc($addr),
 					dbesc($addr),
 					dbesc($server),
@@ -84,9 +84,9 @@ class Diaspora
 					dbesc($batch),
 					dbesc(NETWORK_DIASPORA),
 					intval(CONTACT_IS_FOLLOWER),
-					dbesc(datetime_convert()),
-					dbesc(datetime_convert()),
-					dbesc(datetime_convert())
+					dbesc(Temporal::convert()),
+					dbesc(Temporal::convert()),
+					dbesc(Temporal::convert())
 				);
 
 				$relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
@@ -870,7 +870,7 @@ class Diaspora
 				dbesc($arr["confirm"]),
 				dbesc($arr["alias"]),
 				dbesc($arr["pubkey"]),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
 				dbesc($arr["url"]),
 				dbesc($arr["network"])
 			);
@@ -893,7 +893,7 @@ class Diaspora
 				dbesc($arr["network"]),
 				dbesc($arr["alias"]),
 				dbesc($arr["pubkey"]),
-				dbesc(datetime_convert())
+				dbesc(Temporal::convert())
 			);
 		}
 
@@ -1653,9 +1653,9 @@ class Diaspora
 		$text = unxmlify($data->text);
 
 		if (isset($data->created_at)) {
-			$created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
+			$created_at = Temporal::convert(notags(unxmlify($data->created_at)));
 		} else {
-			$created_at = datetime_convert();
+			$created_at = Temporal::convert();
 		}
 
 		if (isset($data->thread_parent_guid)) {
@@ -1785,7 +1785,7 @@ class Diaspora
 		$msg_guid = notags(unxmlify($mesg->guid));
 		$msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
 		$msg_text = unxmlify($mesg->text);
-		$msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
+		$msg_created_at = Temporal::convert(notags(unxmlify($mesg->created_at)));
 
 		if ($msg_conversation_guid != $guid) {
 			logger("message conversation guid does not belong to the current conversation.");
@@ -1830,7 +1830,7 @@ class Diaspora
 
 		dba::unlock();
 
-		dba::update('conv', ['updated' => datetime_convert()], ['id' => $conversation["id"]]);
+		dba::update('conv', ['updated' => Temporal::convert()], ['id' => $conversation["id"]]);
 
 		notification(
 			[
@@ -1864,7 +1864,7 @@ class Diaspora
 		$author = notags(unxmlify($data->author));
 		$guid = notags(unxmlify($data->guid));
 		$subject = notags(unxmlify($data->subject));
-		$created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
+		$created_at = Temporal::convert(notags(unxmlify($data->created_at)));
 		$participants = notags(unxmlify($data->participants));
 
 		$messages = $data->message;
@@ -1896,7 +1896,7 @@ class Diaspora
 				dbesc($guid),
 				dbesc($author),
 				dbesc($created_at),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
 				dbesc($subject),
 				dbesc($participants)
 			);
@@ -2097,7 +2097,7 @@ class Diaspora
 		$guid = notags(unxmlify($data->guid));
 		$conversation_guid = notags(unxmlify($data->conversation_guid));
 		$text = unxmlify($data->text);
-		$created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
+		$created_at = Temporal::convert(notags(unxmlify($data->created_at)));
 
 		$contact = self::allowedContactByHandle($importer, $author, true);
 		if (!$contact) {
@@ -2163,7 +2163,7 @@ class Diaspora
 
 		dba::unlock();
 
-		dba::update('conv', ['updated' => datetime_convert()], ['id' => $conversation["id"]]);
+		dba::update('conv', ['updated' => Temporal::convert()], ['id' => $conversation["id"]]);
 		return true;
 	}
 
@@ -2314,7 +2314,7 @@ class Diaspora
 		$birthday = str_replace("1000", "1901", $birthday);
 
 		if ($birthday != "") {
-			$birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
+			$birthday = Temporal::convert($birthday, "UTC", "UTC", "Y-m-d");
 		}
 
 		// this is to prevent multiple birthday notifications in a single year
@@ -2330,7 +2330,7 @@ class Diaspora
 			dbesc($name),
 			dbesc($nick),
 			dbesc($author),
-			dbesc(datetime_convert()),
+			dbesc(Temporal::convert()),
 			dbesc($birthday),
 			dbesc($location),
 			dbesc($about),
@@ -2536,7 +2536,7 @@ class Diaspora
 			intval($importer["uid"]),
 			dbesc($ret["network"]),
 			dbesc($ret["addr"]),
-			datetime_convert(),
+			Temporal::convert(),
 			dbesc($ret["url"]),
 			dbesc(normalise_link($ret["url"])),
 			dbesc($batch),
@@ -2579,7 +2579,7 @@ class Diaspora
 				0,
 				dbesc(L10n::t("Sharing notification from Diaspora network")),
 				dbesc($hash),
-				dbesc(datetime_convert())
+				dbesc(Temporal::convert())
 			);
 		} else {
 			// automatic friend approval
@@ -2610,8 +2610,8 @@ class Diaspora
 				WHERE `id` = %d
 				",
 				intval($new_relation),
-				dbesc(datetime_convert()),
-				dbesc(datetime_convert()),
+				dbesc(Temporal::convert()),
+				dbesc(Temporal::convert()),
 				intval($contact_record["id"])
 			);
 
@@ -2715,7 +2715,7 @@ class Diaspora
 	{
 		$author = notags(unxmlify($data->author));
 		$guid = notags(unxmlify($data->guid));
-		$created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
+		$created_at = Temporal::convert(notags(unxmlify($data->created_at)));
 		$root_author = notags(unxmlify($data->root_author));
 		$root_guid = notags(unxmlify($data->root_guid));
 		/// @todo handle unprocessed property "provider_display_name"
@@ -2851,8 +2851,8 @@ class Diaspora
 					'deleted' => true,
 					'title' => '',
 					'body' => '',
-					'edited' => datetime_convert(),
-					'changed' => datetime_convert()],
+					'edited' => Temporal::convert(),
+					'changed' => Temporal::convert()],
 				['id' => $item["id"]]
 			);
 
@@ -2929,7 +2929,7 @@ class Diaspora
 	{
 		$author = notags(unxmlify($data->author));
 		$guid = notags(unxmlify($data->guid));
-		$created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
+		$created_at = Temporal::convert(notags(unxmlify($data->created_at)));
 		$public = notags(unxmlify($data->public));
 		$text = unxmlify($data->text);
 		$provider_display_name = notags(unxmlify($data->provider_display_name));
@@ -3606,10 +3606,10 @@ class Diaspora
 		}
 
 		if ($event['start']) {
-			$eventdata['start'] = datetime_convert($eventdata['timezone'], "UTC", $event['start'], $mask);
+			$eventdata['start'] = Temporal::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
 		}
 		if ($event['finish'] && !$event['nofinish']) {
-			$eventdata['end'] = datetime_convert($eventdata['timezone'], "UTC", $event['finish'], $mask);
+			$eventdata['end'] = Temporal::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
 		}
 		if ($event['summary']) {
 			$eventdata['summary'] = html_entity_decode(bb2diaspora($event['summary']));
@@ -3651,7 +3651,7 @@ class Diaspora
 
 		$public = (($item["private"]) ? "false" : "true");
 
-		$created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
+		$created = Temporal::convert($item["created"], "UTC", "UTC", 'Y-m-d\TH:i:s\Z');
 
 		// Detect a share element and do a reshare
 		if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
@@ -3854,7 +3854,7 @@ class Diaspora
 		$parent = $p[0];
 
 		$text = html_entity_decode(bb2diaspora($item["body"]));
-		$created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
+		$created = Temporal::convert($item["created"], "UTC", "UTC", 'Y-m-d\TH:i:s\Z');
 
 		$comment = ["author" => self::myHandle($owner),
 				"guid" => $item["guid"],
@@ -4085,12 +4085,12 @@ class Diaspora
 			"author" => $cnv["creator"],
 			"guid" => $cnv["guid"],
 			"subject" => $cnv["subject"],
-			"created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
+			"created_at" => Temporal::convert($cnv['created'], "UTC", "UTC", 'Y-m-d\TH:i:s\Z'),
 			"participants" => $cnv["recips"]
 		];
 
 		$body = bb2diaspora($item["body"]);
-		$created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
+		$created = Temporal::convert($item["created"], "UTC", "UTC", 'Y-m-d\TH:i:s\Z');
 
 		$msg = [
 			"author" => $myaddr,
@@ -4108,7 +4108,7 @@ class Diaspora
 					"author" => $cnv["creator"],
 					"guid" => $cnv["guid"],
 					"subject" => $cnv["subject"],
-					"created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
+					"created_at" => Temporal::convert($cnv['created'], "UTC", "UTC", 'Y-m-d\TH:i:s\Z'),
 					"participants" => $cnv["recips"],
 					"message" => $msg];
 
@@ -4216,7 +4216,7 @@ class Diaspora
 				if ($year < 1004) {
 					$year = 1004;
 				}
-				$dob = datetime_convert('UTC', 'UTC', $year . '-' . $month . '-'. $day, 'Y-m-d');
+				$dob = Temporal::convert($year . '-' . $month . '-'. $day, 'UTC', 'UTC', 'Y-m-d');
 			}
 
 			$about = $profile['about'];
diff --git a/src/Protocol/OStatus.php b/src/Protocol/OStatus.php
index 3c0f3627be..e2bb312e75 100644
--- a/src/Protocol/OStatus.php
+++ b/src/Protocol/OStatus.php
@@ -4,7 +4,6 @@
  */
 namespace Friendica\Protocol;
 
-use Friendica\App;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\Cache;
 use Friendica\Core\Config;
@@ -12,13 +11,14 @@ use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
-use Friendica\Model\GContact;
 use Friendica\Model\Conversation;
+use Friendica\Model\GContact;
 use Friendica\Model\Item;
 use Friendica\Network\Probe;
 use Friendica\Object\Image;
 use Friendica\Util\Lock;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use Friendica\Util\XML;
 use dba;
 use DOMDocument;
@@ -199,7 +199,7 @@ class OStatus
 				$contact["location"] = $value;
 			}
 
-			$contact['name-date'] = datetime_convert();
+			$contact['name-date'] = Temporal::convert();
 
 			dba::update('contact', $contact, ['id' => $contact["id"]], $current);
 
@@ -220,7 +220,7 @@ class OStatus
 						'nurl' => normalise_link($author["author-link"]),
 						'nick' => $contact["nick"], 'alias' => $contact["alias"],
 						'about' => $contact["about"], 'location' => $contact["location"],
-						'success_update' => datetime_convert(), 'last-update' => datetime_convert()];
+						'success_update' => Temporal::convert(), 'last-update' => Temporal::convert()];
 
 				dba::update('contact', $fields, ['id' => $cid], $old_contact);
 
@@ -558,7 +558,7 @@ class OStatus
 		dba::update(
 			'item',
 			['deleted' => true, 'title' => '', 'body' => '',
-					'edited' => datetime_convert(), 'changed' => datetime_convert()],
+					'edited' => Temporal::convert(), 'changed' => Temporal::convert()],
 			['id' => $deleted["id"]]
 		);
 
@@ -1273,7 +1273,7 @@ class OStatus
 		XML::addElement($doc, $root, "title", $title);
 		XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], $a->config["sitename"]));
 		XML::addElement($doc, $root, "logo", $owner["photo"]);
-		XML::addElement($doc, $root, "updated", datetime_convert("UTC", "UTC", "now", ATOM_TIME));
+		XML::addElement($doc, $root, "updated", Temporal::convert("now", "UTC", "UTC", ATOM_TIME));
 
 		$author = self::addAuthor($doc, $owner);
 		$root->appendChild($author);
@@ -1539,7 +1539,7 @@ class OStatus
 		XML::addElement($doc, $source, "link", "", ["rel" => "alternate", "type" => "text/html", "href" => $contact["alias"]]);
 		XML::addElement($doc, $source, "link", "", ["rel" => "self", "type" => "application/atom+xml", "href" => $contact["poll"]]);
 		XML::addElement($doc, $source, "icon", $contact["photo"]);
-		XML::addElement($doc, $source, "updated", datetime_convert("UTC", "UTC", $contact["success_update"]."+00:00", ATOM_TIME));
+		XML::addElement($doc, $source, "updated", Temporal::convert($contact["success_update"]."+00:00", "UTC", "UTC", ATOM_TIME));
 
 		return $source;
 	}
@@ -1923,8 +1923,8 @@ class OStatus
 
 		XML::addElement($doc, $entry, "activity:verb", $verb);
 
-		XML::addElement($doc, $entry, "published", datetime_convert("UTC", "UTC", $item["created"]."+00:00", ATOM_TIME));
-		XML::addElement($doc, $entry, "updated", datetime_convert("UTC", "UTC", $item["edited"]."+00:00", ATOM_TIME));
+		XML::addElement($doc, $entry, "published", Temporal::convert($item["created"]."+00:00", "UTC", "UTC", ATOM_TIME));
+		XML::addElement($doc, $entry, "updated", Temporal::convert($item["edited"]."+00:00", "UTC", "UTC", ATOM_TIME));
 	}
 
 	/**
@@ -2127,7 +2127,7 @@ class OStatus
 			$last_update = 'now -30 days';
 		}
 
-		$check_date = datetime_convert('UTC', 'UTC', $last_update, 'Y-m-d H:i:s');
+		$check_date = Temporal::convert($last_update);
 		$authorid = Contact::getIdForURL($owner["url"], 0);
 
 		$sql_extra = '';
diff --git a/src/Protocol/PortableContact.php b/src/Protocol/PortableContact.php
index e70e67366c..7103d34648 100644
--- a/src/Protocol/PortableContact.php
+++ b/src/Protocol/PortableContact.php
@@ -16,6 +16,7 @@ use Friendica\Model\GContact;
 use Friendica\Model\Profile;
 use Friendica\Network\Probe;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 use dba;
 use DOMDocument;
 use DOMXPath;
@@ -314,7 +315,7 @@ class PortableContact
 		$contact = ["url" => $profile];
 
 		if ($gcontacts[0]["created"] <= NULL_DATE) {
-			$contact['created'] = datetime_convert();
+			$contact['created'] = Temporal::convert();
 		}
 
 		if ($force) {
@@ -337,7 +338,7 @@ class PortableContact
 		if ($server_url != "") {
 			if (!self::checkServer($server_url, $gcontacts[0]["network"], $force)) {
 				if ($force) {
-					$fields = ['last_failure' => datetime_convert()];
+					$fields = ['last_failure' => Temporal::convert()];
 					dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 				}
 
@@ -411,14 +412,14 @@ class PortableContact
 
 						// Set the date of the last contact
 						/// @todo By now the function "update_gcontact" doesn't work with this field
-						//$contact["last_contact"] = datetime_convert();
+						//$contact["last_contact"] = Temporal::convert();
 
 						$contact = array_merge($contact, $noscrape);
 
 						GContact::update($contact);
 
 						if (trim($noscrape["updated"]) != "") {
-							$fields = ['last_contact' => datetime_convert()];
+							$fields = ['last_contact' => Temporal::convert()];
 							dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 
 							logger("Profile ".$profile." was last updated at ".$noscrape["updated"]." (noscrape)", LOGGER_DEBUG);
@@ -467,7 +468,7 @@ class PortableContact
 		}
 
 		if (($data["poll"] == "") || (in_array($data["network"], [NETWORK_FEED, NETWORK_PHANTOM]))) {
-			$fields = ['last_failure' => datetime_convert()];
+			$fields = ['last_failure' => Temporal::convert()];
 			dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 
 			logger("Profile ".$profile." wasn't reachable (profile)", LOGGER_DEBUG);
@@ -483,7 +484,7 @@ class PortableContact
 		$feedret = Network::curl($data["poll"]);
 
 		if (!$feedret["success"]) {
-			$fields = ['last_failure' => datetime_convert()];
+			$fields = ['last_failure' => Temporal::convert()];
 			dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 
 			logger("Profile ".$profile." wasn't reachable (no feed)", LOGGER_DEBUG);
@@ -532,7 +533,7 @@ class PortableContact
 
 	public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 	{
-		$now = strtotime(datetime_convert());
+		$now = strtotime(Temporal::convert());
 
 		if ($updated > $last_contact) {
 			$contact_time = strtotime($updated);
@@ -921,7 +922,7 @@ class PortableContact
 		$gserver = dba::selectFirst('gserver', [], ['nurl' => normalise_link($server_url)]);
 		if (DBM::is_result($gserver)) {
 			if ($gserver["created"] <= NULL_DATE) {
-				$fields = ['created' => datetime_convert()];
+				$fields = ['created' => Temporal::convert()];
 				$condition = ['nurl' => normalise_link($server_url)];
 				dba::update('gserver', $fields, $condition);
 			}
@@ -968,7 +969,7 @@ class PortableContact
 		// Mastodon uses the "@" for user profiles.
 		// But this can be misunderstood.
 		if (parse_url($server_url, PHP_URL_USER) != '') {
-			dba::update('gserver', ['last_failure' => datetime_convert()], ['nurl' => normalise_link($server_url)]);
+			dba::update('gserver', ['last_failure' => Temporal::convert()], ['nurl' => normalise_link($server_url)]);
 			return false;
 		}
 
@@ -984,7 +985,7 @@ class PortableContact
 		if (DBM::is_result($gserver) && ($orig_server_url == $server_url) &&
 			($serverret['errno'] == CURLE_OPERATION_TIMEDOUT)) {
 			logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
-			dba::update('gserver', ['last_failure' => datetime_convert()], ['nurl' => normalise_link($server_url)]);
+			dba::update('gserver', ['last_failure' => Temporal::convert()], ['nurl' => normalise_link($server_url)]);
 			return false;
 		}
 
@@ -999,7 +1000,7 @@ class PortableContact
 			// Quit if there is a timeout
 			if ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 				logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
-				dba::update('gserver', ['last_failure' => datetime_convert()], ['nurl' => normalise_link($server_url)]);
+				dba::update('gserver', ['last_failure' => Temporal::convert()], ['nurl' => normalise_link($server_url)]);
 				return false;
 			}
 
@@ -1331,9 +1332,9 @@ class PortableContact
 
 		if ($failure) {
 			$last_contact = $orig_last_contact;
-			$last_failure = datetime_convert();
+			$last_failure = Temporal::convert();
 		} else {
-			$last_contact = datetime_convert();
+			$last_contact = Temporal::convert();
 			$last_failure = $orig_last_failure;
 		}
 
@@ -1361,7 +1362,7 @@ class PortableContact
 			dba::update('gserver', $fields, ['nurl' => normalise_link($server_url)]);
 		} elseif (!$failure) {
 			$fields['nurl'] = normalise_link($server_url);
-			$fields['created'] = datetime_convert();
+			$fields['created'] = Temporal::convert();
 			dba::insert('gserver', $fields);
 		}
 		logger("End discovery for server " . $server_url, LOGGER_DEBUG);
@@ -1525,7 +1526,7 @@ class PortableContact
 				}
 			}
 
-			$fields = ['last_poco_query' => datetime_convert()];
+			$fields = ['last_poco_query' => Temporal::convert()];
 			dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
 
 			return true;
@@ -1534,7 +1535,7 @@ class PortableContact
 			self::checkServer($server["url"], $server["network"], true);
 
 			// If we couldn't reach the server, we will try it some time later
-			$fields = ['last_poco_query' => datetime_convert()];
+			$fields = ['last_poco_query' => Temporal::convert()];
 			dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
 
 			return false;
@@ -1560,7 +1561,7 @@ class PortableContact
 			foreach ($r as $server) {
 				if (!self::checkServer($server["url"], $server["network"])) {
 					// The server is not reachable? Okay, then we will try it later
-					$fields = ['last_poco_query' => datetime_convert()];
+					$fields = ['last_poco_query' => Temporal::convert()];
 					dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
 					continue;
 				}
diff --git a/src/Util/ParseUrl.php b/src/Util/ParseUrl.php
index 868bd7ede8..23e24b1235 100644
--- a/src/Util/ParseUrl.php
+++ b/src/Util/ParseUrl.php
@@ -73,7 +73,8 @@ class ParseUrl
 			[
 				'url' => normalise_link($url), 'guessing' => !$no_guessing,
 				'oembed' => $do_oembed, 'content' => serialize($data),
-				'created' => datetime_convert()],
+				'created' => Temporal::convert()
+			],
 			true
 		);
 
diff --git a/src/Worker/Cron.php b/src/Worker/Cron.php
index 2c855d569f..0b497f6f17 100644
--- a/src/Worker/Cron.php
+++ b/src/Worker/Cron.php
@@ -8,6 +8,7 @@ use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\Worker;
 use Friendica\Database\DBM;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -70,7 +71,7 @@ Class Cron {
 
 		// once daily run birthday_updates and then expire in background
 		$d1 = Config::get('system', 'last_expire_day');
-		$d2 = intval(datetime_convert('UTC', 'UTC', 'now', 'd'));
+		$d2 = intval(Temporal::convert('now', 'UTC', 'UTC', 'd'));
 
 		if ($d2 != intval($d1)) {
 
@@ -141,7 +142,7 @@ Class Cron {
 
 		Addon::reload();
 
-		$d = datetime_convert();
+		$d = Temporal::convert();
 
 		// Only poll from those with suitable relationships,
 		// and which have a polling address and ignore Diaspora since
@@ -217,33 +218,33 @@ Class Cron {
 				 */
 				switch ($contact['priority']) {
 					case 5:
-						if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + 1 month")) {
+						if (Temporal::convert('now') > Temporal::convert($t . " + 1 month")) {
 							$update = true;
 						}
 						break;
 					case 4:
-						if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + 1 week")) {
+						if (Temporal::convert('now') > Temporal::convert($t . " + 1 week")) {
 							$update = true;
 						}
 						break;
 					case 3:
-						if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + 1 day")) {
+						if (Temporal::convert('now') > Temporal::convert($t . " + 1 day")) {
 							$update = true;
 						}
 						break;
 					case 2:
-						if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + 12 hour")) {
+						if (Temporal::convert('now') > Temporal::convert($t . " + 12 hour")) {
 							$update = true;
 						}
 						break;
 					case 1:
-						if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + 1 hour")) {
+						if (Temporal::convert('now') > Temporal::convert($t . " + 1 hour")) {
 							$update = true;
 						}
 						break;
 					case 0:
 					default:
-						if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + ".$min_poll_interval." minute")) {
+						if (Temporal::convert('now') > Temporal::convert($t . " + ".$min_poll_interval." minute")) {
 							$update = true;
 						}
 						break;
diff --git a/src/Worker/CronHooks.php b/src/Worker/CronHooks.php
index ed16750313..7aaf2567fc 100644
--- a/src/Worker/CronHooks.php
+++ b/src/Worker/CronHooks.php
@@ -8,6 +8,7 @@ namespace Friendica\Worker;
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\Worker;
+use Friendica\Util\Temporal;
 
 Class CronHooks {
 	public static function execute($hook = '') {
@@ -44,7 +45,7 @@ Class CronHooks {
 
 		logger('cronhooks: start');
 
-		$d = datetime_convert();
+		$d = Temporal::convert();
 
 		if (is_array($a->hooks) && array_key_exists("cron", $a->hooks)) {
 			foreach ($a->hooks["cron"] as $hook) {
diff --git a/src/Worker/DiscoverPoCo.php b/src/Worker/DiscoverPoCo.php
index 0657b0e1b2..5bcff6d1a7 100644
--- a/src/Worker/DiscoverPoCo.php
+++ b/src/Worker/DiscoverPoCo.php
@@ -12,6 +12,7 @@ use Friendica\Model\GContact;
 use Friendica\Network\Probe;
 use Friendica\Protocol\PortableContact;
 use Friendica\Util\Network;
+use Friendica\Util\Temporal;
 
 require_once 'include/datetime.php';
 
@@ -197,7 +198,7 @@ class DiscoverPoCo {
 				}
 			} else {
 				q("UPDATE `gcontact` SET `last_failure` = '%s' WHERE `nurl` = '%s'",
-					dbesc(datetime_convert()), dbesc(normalise_link($user["url"])));
+					dbesc(Temporal::convert()), dbesc(normalise_link($user["url"])));
 			}
 
 			// Quit the loop after 3 minutes
diff --git a/src/Worker/OnePoll.php b/src/Worker/OnePoll.php
index c83c69f7ae..78fdd707e3 100644
--- a/src/Worker/OnePoll.php
+++ b/src/Worker/OnePoll.php
@@ -14,6 +14,7 @@ use Friendica\Protocol\Email;
 use Friendica\Protocol\PortableContact;
 use Friendica\Util\Network;
 use Friendica\Util\XML;
+use Friendica\Util\Temporal;
 use dba;
 
 require_once 'include/dba.php';
@@ -43,7 +44,7 @@ class OnePoll
 			return;
 		}
 
-		$d = datetime_convert();
+		$d = Temporal::convert();
 
 		$contact = dba::selectFirst('contact', [], ['id' => $contact_id]);
 		if (!DBM::is_result($contact)) {
@@ -69,7 +70,7 @@ class OnePoll
 		// Diaspora users, archived users and followers are only checked if they still exist.
 		if ($contact['archive'] || ($contact["network"] == NETWORK_DIASPORA) || ($contact["rel"] == CONTACT_IS_FOLLOWER)) {
 			$last_updated = PortableContact::lastUpdated($contact["url"], true);
-			$updated = datetime_convert();
+			$updated = Temporal::convert();
 			if ($last_updated) {
 				logger('Contact '.$contact['id'].' had last update on '.$last_updated, LOGGER_DEBUG);
 
@@ -98,7 +99,7 @@ class OnePoll
 			$contact['priority'] = intval($poll_interval);
 			$hub_update = false;
 
-			if (datetime_convert('UTC', 'UTC', 'now') > datetime_convert('UTC', 'UTC', $t . " + 1 day")) {
+			if (Temporal::convert('now') > Temporal::convert($t . " + 1 day")) {
 				$hub_update = true;
 			}
 		} else {
@@ -106,8 +107,8 @@ class OnePoll
 		}
 
 		$last_update = (($contact['last-update'] <= NULL_DATE)
-			? datetime_convert('UTC', 'UTC', 'now - 7 days', ATOM_TIME)
-			: datetime_convert('UTC', 'UTC', $contact['last-update'], ATOM_TIME)
+			? Temporal::convert('now - 7 days', 'UTC', 'UTC', ATOM_TIME)
+			: Temporal::convert($contact['last-update'], 'UTC', 'UTC', ATOM_TIME)
 		);
 
 		// Update the contact entry
@@ -116,7 +117,7 @@ class OnePoll
 				logger("Skipping probably dead contact ".$contact['url']);
 
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				return;
 			}
 
@@ -125,7 +126,7 @@ class OnePoll
 				logger('Contact is marked dead');
 
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				return;
 			} else {
 				Contact::unmarkForArchival($contact);
@@ -136,7 +137,7 @@ class OnePoll
 			logger('Ignore public contacts');
 
 			// set the last-update so we don't keep polling
-			dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+			dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 			return;
 		}
 
@@ -148,7 +149,7 @@ class OnePoll
 			logger('No self contact for user '.$importer_uid);
 
 			// set the last-update so we don't keep polling
-			dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+			dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 			return;
 		}
 
@@ -184,7 +185,7 @@ class OnePoll
 
 			if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				Contact::markForArchival($contact);
 				return;
 			}
@@ -206,7 +207,7 @@ class OnePoll
 				Contact::markForArchival($contact);
 
 				// set the last-update so we don't keep polling
-				$fields = ['last-update' => datetime_convert(), 'failure_update' => datetime_convert()];
+				$fields = ['last-update' => Temporal::convert(), 'failure_update' => Temporal::convert()];
 				self::updateContact($contact, $fields);
 				return;
 			}
@@ -216,7 +217,7 @@ class OnePoll
 
 				Contact::markForArchival($contact);
 
-				$fields = ['last-update' => datetime_convert(), 'failure_update' => datetime_convert()];
+				$fields = ['last-update' => Temporal::convert(), 'failure_update' => Temporal::convert()];
 				self::updateContact($contact, $fields);
 				return;
 			}
@@ -229,7 +230,7 @@ class OnePoll
 
 				// we may not be friends anymore. Will keep trying for one month.
 				// set the last-update so we don't keep polling
-				$fields = ['last-update' => datetime_convert(), 'failure_update' => datetime_convert()];
+				$fields = ['last-update' => Temporal::convert(), 'failure_update' => Temporal::convert()];
 				self::updateContact($contact, $fields);
 
 				Contact::markForArchival($contact);
@@ -240,7 +241,7 @@ class OnePoll
 
 			if ((intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				return;
 			}
 
@@ -275,7 +276,7 @@ class OnePoll
 				logger('ID did not decode: ' . $contact['id'] . ' orig: ' . $orig_id . ' final: ' . $final_dfrn_id);
 
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				Contact::markForArchival($contact);
 				return;
 			}
@@ -310,7 +311,7 @@ class OnePoll
 
 			if ($contact['rel'] == CONTACT_IS_FOLLOWER || $contact['blocked'] || $contact['readonly']) {
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				return;
 			}
 
@@ -320,7 +321,7 @@ class OnePoll
 
 			if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				Contact::markForArchival($contact);
 				return;
 			}
@@ -334,7 +335,7 @@ class OnePoll
 			$mail_disabled = ((function_exists('imap_open') && (! Config::get('system', 'imap_disabled'))) ? 0 : 1);
 			if ($mail_disabled) {
 				// set the last-update so we don't keep polling
-				dba::update('contact', ['last-update' => datetime_convert()], ['id' => $contact['id']]);
+				dba::update('contact', ['last-update' => Temporal::convert()], ['id' => $contact['id']]);
 				Contact::markForArchival($contact);
 				return;
 			}
@@ -354,7 +355,7 @@ class OnePoll
 				unset($password);
 				logger("Mail: Connect to " . $mailconf['user']);
 				if ($mbox) {
-					$fields = ['last_check' => datetime_convert()];
+					$fields = ['last_check' => Temporal::convert()];
 					dba::update('mailacct', $fields, ['id' => $mailconf['id']]);
 					logger("Mail: Connected to " . $mailconf['user']);
 				} else {
@@ -394,7 +395,7 @@ class OnePoll
 								// Only delete when mails aren't automatically moved or deleted
 								if (($mailconf['action'] != 1) && ($mailconf['action'] != 3))
 									if ($meta->deleted && ! $item['deleted']) {
-										$fields = ['deleted' => true, 'changed' => datetime_convert()];
+										$fields = ['deleted' => true, 'changed' => Temporal::convert()];
 										dba::update('item', $fields, ['id' => $item['id']]);
 									}
 
@@ -458,7 +459,7 @@ class OnePoll
 							$datarray['title'] = notags(trim($datarray['title']));
 
 							//$datarray['title'] = notags(trim($meta->subject));
-							$datarray['created'] = datetime_convert('UTC', 'UTC', $meta->date);
+							$datarray['created'] = Temporal::convert($meta->date);
 
 							// Is it a reply?
 							$reply = ((substr(strtolower($datarray['title']), 0, 3) == "re:") ||
@@ -571,7 +572,7 @@ class OnePoll
 			if (!strstr($xml, '<')) {
 				logger('post_handshake: response from ' . $url . ' did not contain XML.');
 
-				$fields = ['last-update' => datetime_convert(), 'failure_update' => datetime_convert()];
+				$fields = ['last-update' => Temporal::convert(), 'failure_update' => Temporal::convert()];
 				self::updateContact($contact, $fields);
 				Contact::markForArchival($contact);
 				return;
@@ -615,19 +616,19 @@ class OnePoll
 				}
 			}
 
-			$updated = datetime_convert();
+			$updated = Temporal::convert();
 
 			self::updateContact($contact, ['last-update' => $updated, 'success_update' => $updated]);
 			dba::update('gcontact', ['last_contact' => $updated], ['nurl' => $contact['nurl']]);
 			Contact::unmarkForArchival($contact);
 		} elseif (in_array($contact["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, NETWORK_FEED])) {
-			$updated = datetime_convert();
+			$updated = Temporal::convert();
 
 			self::updateContact($contact, ['last-update' => $updated, 'failure_update' => $updated]);
 			dba::update('gcontact', ['last_failure' => $updated], ['nurl' => $contact['nurl']]);
 			Contact::markForArchival($contact);
 		} else {
-			$updated = datetime_convert();
+			$updated = Temporal::convert();
 			dba::update('contact', ['last-update' => $updated], ['id' => $contact['id']]);
 		}
 
diff --git a/src/Worker/UpdateGContact.php b/src/Worker/UpdateGContact.php
index a506f0e087..520dfed3b3 100644
--- a/src/Worker/UpdateGContact.php
+++ b/src/Worker/UpdateGContact.php
@@ -1,16 +1,20 @@
 <?php
+
 /**
  * @file src/Worker/UpdateGcontact.php
  */
+
 namespace Friendica\Worker;
 
-use Friendica\Core\Config;
 use Friendica\Database\DBM;
 use Friendica\Network\Probe;
 use Friendica\Protocol\PortableContact;
+use Friendica\Util\Temporal;
 
-class UpdateGContact {
-	public static function execute($contact_id) {
+class UpdateGContact
+{
+	public static function execute($contact_id)
+	{
 		global $a;
 
 		logger('update_gcontact: start');
@@ -33,25 +37,30 @@ class UpdateGContact {
 		$data = Probe::uri($r[0]["url"]);
 
 		if (!in_array($data["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS])) {
-			if ($r[0]["server_url"] != "")
+			if ($r[0]["server_url"] != "") {
 				PortableContact::checkServer($r[0]["server_url"], $r[0]["network"]);
+			}
 
 			q("UPDATE `gcontact` SET `last_failure` = '%s' WHERE `id` = %d",
-				dbesc(datetime_convert()), intval($contact_id));
+				dbesc(Temporal::convert()), intval($contact_id));
 			return;
 		}
 
-		if (($data["name"] == "") && ($r[0]['name'] != ""))
+		if (($data["name"] == "") && ($r[0]['name'] != "")) {
 			$data["name"] = $r[0]['name'];
+		}
 
-		if (($data["nick"] == "") && ($r[0]['nick'] != ""))
+		if (($data["nick"] == "") && ($r[0]['nick'] != "")) {
 			$data["nick"] = $r[0]['nick'];
+		}
 
-		if (($data["addr"] == "") && ($r[0]['addr'] != ""))
+		if (($data["addr"] == "") && ($r[0]['addr'] != "")) {
 			$data["addr"] = $r[0]['addr'];
+		}
 
-		if (($data["photo"] == "") && ($r[0]['photo'] != ""))
+		if (($data["photo"] == "") && ($r[0]['photo'] != "")) {
 			$data["photo"] = $r[0]['photo'];
+		}
 
 
 		q("UPDATE `gcontact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `photo` = '%s'
@@ -60,8 +69,8 @@ class UpdateGContact {
 					dbesc($data["nick"]),
 					dbesc($data["addr"]),
 					dbesc($data["photo"]),
-					intval($contact_id)
-				);
+			intval($contact_id)
+		);
 
 		q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `photo` = '%s'
 					WHERE `uid` = 0 AND `addr` = '' AND `nurl` = '%s'",
@@ -70,12 +79,12 @@ class UpdateGContact {
 					dbesc($data["addr"]),
 					dbesc($data["photo"]),
 					dbesc(normalise_link($data["url"]))
-				);
+		);
 
 		q("UPDATE `contact` SET `addr` = '%s'
 					WHERE `uid` != 0 AND `addr` = '' AND `nurl` = '%s'",
 					dbesc($data["addr"]),
 					dbesc(normalise_link($data["url"]))
-				);
+		);
 	}
 }