initial

include/datetime.php

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+<?php
+
+if(! function_exists('timezone_cmp')) {
+function timezone_cmp($a, $b) {
+	if(strstr($a,'/') && strstr($b,'/')) {
+		if ($a == $b) return 0;
+		return ($a < $b) ? -1 : 1;
+	}
+	if(strstr($a,'/')) return -1;
+	if(strstr($b,'/')) return  1;
+	if ( t($a) == t($b)) return 0;
+	return ( t($a) < t($b)) ? -1 : 1;
+}}
+
+
+if(! function_exists('select_timezone')) {
+function select_timezone($current = 'America/Los_Angeles') {
+
+	$timezone_identifiers = DateTimeZone::listIdentifiers();
+	
+	$o ='<select id="timezone_select" name="timezone">';
+
+	usort($timezone_identifiers, 'timezone_cmp');
+	$continent = '';
+	foreach($timezone_identifiers as $value) {
+		$ex = explode("/", $value);
+		if(count($ex) > 1) {
+			if($ex[0] != $continent) {
+				if($continent != '')
+					$o .= '</optgroup>';
+				$continent = $ex[0];
+				$o .= '<optgroup label="' . t($continent) . '">';
+			}
+			if(count($ex) > 2)
+				$city = substr($value,strpos($value,'/')+1);
+			else
+				$city = $ex[1];
+		}
+		else {
+			$city = $ex[0];
+			if($continent != 'Miscellaneous') {
+				$o .= '</optgroup>';
+				$continent = 'Miscellaneous';
+				$o .= '<optgroup label="' . t($continent) . '">';	
+			}
+		}
+		$city = str_replace('_', ' ',  t($city));
+		$selected = (($value == $current) ? " selected=\"selected\" " : "");
+		$o .= "<option value=\"$value\" $selected >$city</option>";
+	}    
+	$o .= '</optgroup></select>';
+	return $o;
+}}
+
+// General purpose date parse/convert function.
+// $from = source timezone
+// $to   = dest timezone
+// $s    = some parseable date/time string
+// $fmt  = output format
+
+if(! function_exists('datetime_convert')) {
+function datetime_convert($from = 'UTC', $to = 'UTC', $s = 'now', $fmt = "Y-m-d H:i:s") {
+
+    // Slight hackish adjustment so that 'zero' datetime actually returns what is intended
+        // otherwise we end up with -0001-11-30 ...
+    // add 32 days so that we at least get year 00, and then hack around the fact that
+        // months and days always start with 1.
+
+    if(substr($s,0,10) == '0000-00-00') {
+        $d = new DateTime($s . ' + 32 days', new DateTimeZone('UTC'));
+        return str_replace('1','0',$d->format($fmt));
+    }
+
+    $d = new DateTime($s, new DateTimeZone($from));
+    $d->setTimeZone(new DateTimeZone($to));
+    return($d->format($fmt));
+}}
+
+function dob($dob) {
+	list($year,$month,$day) = sscanf($dob,'%4d-%2d-%2d');
+	$y = datetime_convert('UTC',date_default_timezone_get(),'now','Y');
+	$o = datesel('',1920,$y,true,$year,$month,$day);
+	return $o;
+}
+
+if(! function_exists('datesel')) {
+function datesel($pre,$ymin,$ymax,$allow_blank,$y,$m,$d) {
+
+	$o = '';
+	$o .= "<select name=\"{$pre}year\" class=\"{$pre}year\" size=\"1\">";
+	if($allow_blank) {
+		$sel = (($y == '0000') ? " selected=\"selected\" " : "");
+		$o .= "<option value=\"0000\" $sel ></option>";
+	}
+
+	for($x = $ymax; $x >= $ymin; $x --) {
+		$sel = (($x == $y) ? " selected=\"selected\" " : "");
+		$o .= "<option value=\"$x\" $sel>$x</option>";
+	}
+  
+	$o .= "</select> <select name=\"{$pre}month\" class=\"{$pre}month\" size=\"1\">";
+	for($x = 0; $x <= 12; $x ++) {
+		$sel = (($x == $m) ? " selected=\"selected\" " : "");
+		$y = (($x) ? $x : '');
+		$o .= "<option value=\"$x\" $sel>$y</option>";
+	}
+
+	$o .= "</select> <select name=\"{$pre}day\" class=\"{$pre}day\" size=\"1\">";
+	for($x = 0; $x <= 31; $x ++) {
+		$sel = (($x == $d) ? " selected=\"selected\" " : "");
+		$y = (($x) ? $x : '');
+		$o .= "<option value=\"$x\" $sel>$y</option>";
+	}
+
+	$o .= "</select>";
+	return $o;
+}}
+
+
+if(! function_exists('relative_date')) {
+function relative_date($posted_date) {
+
+	$localtime = datetime_convert('UTC',date_default_timezone_get(),$posted_date); 
+
+	$abs = strtotime($localtime);
+	$etime = time() - $abs;
+    
+	if ($etime < 1) {
+		return t('less than a second ago');
+	}
+    
+	$a = array( 12 * 30 * 24 * 60 * 60  =>  array( t('year'),   t('years')),
+		    30 * 24 * 60 * 60       =>  array( t('month'),  t('months')),
+		    7  * 24 * 60 * 60       =>  array( t('week'),   t('weeks')),
+		    24 * 60 * 60            =>  array( t('day'),    t('days')),
+		    60 * 60                 =>  array( t('hour'),   t('hours')),
+		    60                      =>  array( t('minute'), t('minutes')),
+		    1                       =>  array( t('second'), t('seconds'))
+	);
+    
+	foreach ($a as $secs => $str) {
+	$d = $etime / $secs;
+	if ($d >= 1) {
+		$r = round($d);
+		return $r . ' ' . (($r == 1) ? $str[0] : $str[1]) . t(' ago');
+        }
+    }
+}}
+
+
+function age($dob,$owner_tz = '',$viewer_tz = '') {
+	if(! intval($dob))
+		return 0;
+	if(! $owner_tz)
+		$owner_tz = date_default_timezone_get();
+	if(! $viewer_tz)
+		$viewer_tz = date_default_timezone_get();
+
+	$birthdate = datetime_convert('UTC',$owner_tz,$dob . ' 00:00:00+00:00','Y-m-d');
+	list($year,$month,$day) = explode("-",$birthdate);
+	$year_diff  = datetime_convert('UTC',$viewer_tz,'now','Y') - $year;
+	$curr_month = datetime_convert('UTC',$viewer_tz,'now','m');
+	$curr_day   = datetime_convert('UTC',$viewer_tz,'now','d');
+
+	if(($curr_month < $month) || (($curr_month == $month) && ($curr_day < $day)))
+		$year_diff--;
+	return $year_diff;
+}