143 lines
3.4 KiB
PHP
143 lines
3.4 KiB
PHP
<?php
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/**
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* @file src/Util/DateTimeFormat.php
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*/
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namespace Friendica\Util;
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use DateTime;
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use DateTimeZone;
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use Exception;
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/**
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* @brief Temporal class
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*/
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class DateTimeFormat
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{
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const ATOM = 'Y-m-d\TH:i:s\Z';
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const MYSQL = 'Y-m-d H:i:s';
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/**
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* convert() shorthand for UTC.
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*
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* @param string $time A date/time string
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* @param string $format DateTime format string or Temporal constant
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* @return string
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*/
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public static function utc($time, $format = self::MYSQL)
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{
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return self::convert($time, 'UTC', 'UTC', $format);
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}
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/**
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* convert() shorthand for local.
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*
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* @param string $time A date/time string
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* @param string $format DateTime format string or Temporal constant
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* @return string
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*/
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public static function local($time, $format = self::MYSQL)
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{
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return self::convert($time, date_default_timezone_get(), 'UTC', $format);
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}
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/**
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* convert() shorthand for timezoned now.
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*
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* @param string $format DateTime format string or Temporal constant
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* @return string
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*/
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public static function timezoneNow($timezone, $format = self::MYSQL)
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{
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return self::convert('now', $timezone, 'UTC', $format);
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}
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/**
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* convert() shorthand for local now.
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*
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* @param string $format DateTime format string or Temporal constant
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* @return string
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*/
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public static function localNow($format = self::MYSQL)
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{
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return self::local('now', $format);
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}
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/**
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* convert() shorthand for UTC now.
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*
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* @param string $format DateTime format string or Temporal constant
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* @return string
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*/
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public static function utcNow($format = self::MYSQL)
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{
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return self::utc('now', $format);
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}
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/**
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* @brief General purpose date parse/convert/format function.
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*
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* @param string $s Some parseable date/time string
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* @param string $tz_to Destination timezone
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* @param string $tz_from Source timezone
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* @param string $format Output format recognised from php's DateTime class
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* http://www.php.net/manual/en/datetime.format.php
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*
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* @return string Formatted date according to given format
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*/
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public static function convert($s = 'now', $tz_to = 'UTC', $tz_from = 'UTC', $format = self::MYSQL)
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{
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// Defaults to UTC if nothing is set, but throws an exception if set to empty string.
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// Provide some sane defaults regardless.
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if ($tz_from === '') {
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$tz_from = 'UTC';
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}
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if ($tz_to === '') {
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$tz_to = 'UTC';
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}
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if (($s === '') || (!is_string($s))) {
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$s = 'now';
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}
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/*
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* Slight hackish adjustment so that 'zero' datetime actually returns what is intended
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* otherwise we end up with -0001-11-30 ...
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* add 32 days so that we at least get year 00, and then hack around the fact that
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* months and days always start with 1.
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*/
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if (substr($s, 0, 10) <= '0001-01-01') {
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if ($s < '0000-00-00') {
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$s = '0000-00-00';
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}
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$d = new DateTime($s . ' + 32 days', new DateTimeZone('UTC'));
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return str_replace('1', '0', $d->format($format));
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}
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try {
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$from_obj = new DateTimeZone($tz_from);
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} catch (Exception $e) {
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$from_obj = new DateTimeZone('UTC');
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}
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try {
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$d = new DateTime($s, $from_obj);
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} catch (Exception $e) {
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logger('DateTimeFormat::convert: exception: ' . $e->getMessage());
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$d = new DateTime('now', $from_obj);
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}
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try {
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$to_obj = new DateTimeZone($tz_to);
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} catch (Exception $e) {
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$to_obj = new DateTimeZone('UTC');
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}
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$d->setTimeZone($to_obj);
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return $d->format($format);
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}
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}
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