Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file src/Util/DateTimeFormat.php
*/
namespace Friendica\Util;
use Friendica\Core\Logger;
use DateTime;
use DateTimeZone;
use Exception;
/**
* @brief Temporal class
*/
class DateTimeFormat
{
const ATOM = 'Y-m-d\TH:i:s\Z';
const MYSQL = 'Y-m-d H:i:s';
const HTTP = 'D, d M Y H:i:s \G\M\T';
/**
* convert() shorthand for UTC.
*
* @param string $time A date/time string
* @param string $format DateTime format string or Temporal constant
* @return string
* @throws Exception
*/
public static function utc($time, $format = self::MYSQL)
{
return self::convert($time, 'UTC', 'UTC', $format);
}
/**
* convert() shorthand for local.
*
* @param string $time A date/time string
* @param string $format DateTime format string or Temporal constant
* @return string
* @throws Exception
*/
public static function local($time, $format = self::MYSQL)
{
return self::convert($time, date_default_timezone_get(), 'UTC', $format);
}
/**
* convert() shorthand for timezoned now.
*
* @param $timezone
* @param string $format DateTime format string or Temporal constant
* @return string
* @throws Exception
*/
public static function timezoneNow($timezone, $format = self::MYSQL)
{
return self::convert('now', $timezone, 'UTC', $format);
}
/**
* convert() shorthand for local now.
*
* @param string $format DateTime format string or Temporal constant
* @return string
* @throws Exception
*/
public static function localNow($format = self::MYSQL)
{
return self::local('now', $format);
}
/**
* convert() shorthand for UTC now.
*
* @param string $format DateTime format string or Temporal constant
* @return string
* @throws Exception
*/
public static function utcNow($format = self::MYSQL)
{
return self::utc('now', $format);
}
/**
* @brief General purpose date parse/convert/format function.
*
* @param string $s Some parseable date/time string
* @param string $tz_to Destination timezone
* @param string $tz_from Source timezone
* @param string $format Output format recognised from php's DateTime class
* http://www.php.net/manual/en/datetime.format.php
*
* @return string Formatted date according to given format
* @throws Exception
*/
public static function convert($s = 'now', $tz_to = 'UTC', $tz_from = 'UTC', $format = self::MYSQL)
{
// Defaults to UTC if nothing is set, but throws an exception if set to empty string.
// Provide some sane defaults regardless.
if ($tz_from === '') {
$tz_from = 'UTC';
}
if ($tz_to === '') {
$tz_to = 'UTC';
}
if (($s === '') || (!is_string($s))) {
$s = 'now';
}
/*
* Slight hackish adjustment so that 'zero' datetime actually returns what is intended
* otherwise we end up with -0001-11-30 ...
* add 32 days so that we at least get year 00, and then hack around the fact that
* months and days always start with 1.
*/
if (substr($s, 0, 10) <= '0001-01-01') {
if ($s < '0000-00-00') {
$s = '0000-00-00';
}
$d = new DateTime($s . ' + 32 days', new DateTimeZone('UTC'));
return str_replace('1', '0', $d->format($format));
}
try {
$from_obj = new DateTimeZone($tz_from);
} catch (Exception $e) {
$from_obj = new DateTimeZone('UTC');
}
try {
$d = new DateTime($s, $from_obj);
} catch (Exception $e) {
Logger::log('DateTimeFormat::convert: exception: ' . $e->getMessage());
$d = new DateTime('now', $from_obj);
}
try {
$to_obj = new DateTimeZone($tz_to);
} catch (Exception $e) {
$to_obj = new DateTimeZone('UTC');
}
$d->setTimeZone($to_obj);
return $d->format($format);
}
/**
* Checks, if the given string is a date with the pattern YYYY-MM
*
* @param string $dateString The given date
*
* @return boolean True, if the date is a valid pattern
*/
public function isYearMonth(string $dateString)
{
// Check format (2019-01, 2019-1, 2019-10)
if (!preg_match('/^([12]\d{3}-(1[0-2]|0[1-9]|\d))$/', $dateString)) {
return false;
}
$date = DateTime::createFromFormat('Y-m', $dateString);
if (!$date) {
return false;
}
try {
$now = new DateTime();
} catch (\Throwable $t) {
return false;
}
if ($date > $now) {
return false;
}
return true;
}
/**
* Checks, if the given string is a date with the pattern YYYY-MM-DD
*
* @param string $dateString The given date
*
* @return boolean True, if the date is a valid pattern
*/
public function isYearMonthDay(string $dateString)
{
$date = DateTime::createFromFormat('Y-m-d', $dateString);
if (!$date) {
return false;
}
if (DateTime::getLastErrors()['error_count'] || DateTime::getLastErrors()['warning_count']) {
return false;
}
return true;
}
}