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557 lines
21 KiB
557 lines
21 KiB
2 years ago
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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Core date and time related code.
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*
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* @package core
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* @copyright 2015 Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @author Petr Skoda <petr.skoda@totaralms.com>
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*/
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/**
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* Core date and time related code.
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*
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* @since Moodle 2.9
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* @package core
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* @copyright 2015 Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @author Petr Skoda <petr.skoda@totaralms.com>
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*/
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class core_date {
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/** @var array list of recommended zones */
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protected static $goodzones = null;
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/** @var array list of BC zones supported by PHP */
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protected static $bczones = null;
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/** @var array mapping of timezones not supported by PHP */
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protected static $badzones = null;
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/** @var string the default PHP timezone right after config.php */
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protected static $defaultphptimezone = null;
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/**
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* Returns a localised list of timezones.
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* @param string $currentvalue
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* @param bool $include99 should the server timezone info be included?
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* @return array
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*/
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public static function get_list_of_timezones($currentvalue = null, $include99 = false) {
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self::init_zones();
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// Localise first.
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$timezones = array();
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foreach (self::$goodzones as $tzkey => $ignored) {
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$timezones[$tzkey] = self::get_localised_timezone($tzkey);
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}
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core_collator::asort($timezones);
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// Add '99' if requested.
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if ($include99 or $currentvalue == 99) {
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$timezones['99'] = self::get_localised_timezone('99');
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}
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if (!isset($currentvalue) or isset($timezones[$currentvalue])) {
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return $timezones;
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}
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if (is_numeric($currentvalue)) {
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// UTC offset.
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if ($currentvalue == 0) {
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$a = 'UTC';
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} else {
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$modifier = ($currentvalue > 0) ? '+' : '';
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$a = 'UTC' . $modifier . number_format($currentvalue, 1);
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}
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$timezones[$currentvalue] = get_string('timezoneinvalid', 'core_admin', $a);
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} else {
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// Some string we don't recognise.
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$timezones[$currentvalue] = get_string('timezoneinvalid', 'core_admin', $currentvalue);
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}
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return $timezones;
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}
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/**
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* Returns localised timezone name.
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* @param string $tz
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* @return string
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*/
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public static function get_localised_timezone($tz) {
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if ($tz == 99) {
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$tz = self::get_server_timezone();
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$tz = self::get_localised_timezone($tz);
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return get_string('timezoneserver', 'core_admin', $tz);
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}
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if (get_string_manager()->string_exists(strtolower($tz), 'core_timezones')) {
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$tz = get_string(strtolower($tz), 'core_timezones');
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} else if ($tz === 'GMT' or $tz === 'Etc/GMT' or $tz === 'Etc/UTC') {
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$tz = 'UTC';
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} else if (preg_match('|^Etc/GMT([+-])([0-9]+)$|', $tz, $matches)) {
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$sign = $matches[1] === '+' ? '-' : '+';
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$tz = 'UTC' . $sign . $matches[2];
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}
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return $tz;
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}
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/**
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* Normalise the timezone name. If timezone not supported
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* this method falls back to server timezone (if valid)
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* or default PHP timezone.
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*
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* @param int|string|float|DateTimeZone $tz
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* @return string timezone compatible with PHP
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*/
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public static function normalise_timezone($tz) {
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global $CFG;
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if ($tz instanceof DateTimeZone) {
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return $tz->getName();
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}
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self::init_zones();
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$tz = (string)$tz;
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if (isset(self::$goodzones[$tz]) or isset(self::$bczones[$tz])) {
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return $tz;
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}
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$fixed = false;
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if (isset(self::$badzones[$tz])) {
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// Convert to known zone.
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$tz = self::$badzones[$tz];
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$fixed = true;
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} else if (is_numeric($tz)) {
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// Half hour numeric offsets were already tested, try rounding to integers here.
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$roundedtz = (string)(int)$tz;
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if (isset(self::$badzones[$roundedtz])) {
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$tz = self::$badzones[$roundedtz];
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$fixed = true;
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}
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}
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if ($fixed and isset(self::$goodzones[$tz]) or isset(self::$bczones[$tz])) {
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return $tz;
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}
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// Is server timezone usable?
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if (isset($CFG->timezone) and !is_numeric($CFG->timezone)) {
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$result = @timezone_open($CFG->timezone); // Hide notices if invalid.
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if ($result !== false) {
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return $result->getName();
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}
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}
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// Bad luck, use the php.ini default or value set in config.php.
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return self::get_default_php_timezone();
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}
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/**
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* Returns server timezone.
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* @return string normalised timezone name compatible with PHP
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**/
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public static function get_server_timezone() {
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global $CFG;
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if (!isset($CFG->timezone) or $CFG->timezone == 99 or $CFG->timezone === '') {
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return self::get_default_php_timezone();
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}
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return self::normalise_timezone($CFG->timezone);
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}
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/**
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* Returns server timezone.
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* @return DateTimeZone
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**/
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public static function get_server_timezone_object() {
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$tz = self::get_server_timezone();
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return new DateTimeZone($tz);
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}
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/**
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* Set PHP default timezone to $CFG->timezone.
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*/
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public static function set_default_server_timezone() {
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global $CFG;
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if (!isset($CFG->timezone) or $CFG->timezone == 99 or $CFG->timezone === '') {
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date_default_timezone_set(self::get_default_php_timezone());
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return;
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}
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$current = date_default_timezone_get();
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if ($current === $CFG->timezone) {
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// Nothing to do.
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return;
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}
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if (!isset(self::$goodzones)) {
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// For better performance try do do this without full tz init,
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// because this is called from lib/setup.php file on each page.
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$result = @timezone_open($CFG->timezone); // Ignore error if setting invalid.
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if ($result !== false) {
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date_default_timezone_set($result->getName());
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return;
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}
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}
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// Slow way is the last option.
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date_default_timezone_set(self::get_server_timezone());
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}
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/**
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* Returns user timezone.
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*
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* Ideally the parameter should be a real user record,
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* unfortunately the legacy code is using 99 for both server
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* and default value.
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*
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* Example of using legacy API:
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* // Date for other user via legacy API.
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* $datestr = userdate($time, core_date::get_user_timezone($user));
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*
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* The coding style rules in Moodle are moronic,
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* why cannot the parameter names have underscores in them?
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*
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* @param mixed $userorforcedtz user object or legacy forced timezone string or tz object
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* @return string normalised timezone name compatible with PHP
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*/
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public static function get_user_timezone($userorforcedtz = null) {
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global $USER, $CFG;
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if ($userorforcedtz instanceof DateTimeZone) {
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return $userorforcedtz->getName();
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}
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if (isset($userorforcedtz) and !is_object($userorforcedtz) and $userorforcedtz != 99) {
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// Legacy code is forcing timezone in legacy API.
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return self::normalise_timezone($userorforcedtz);
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}
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if (isset($CFG->forcetimezone) and $CFG->forcetimezone != 99) {
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// Override any user timezone.
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return self::normalise_timezone($CFG->forcetimezone);
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}
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if ($userorforcedtz === null) {
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$tz = isset($USER->timezone) ? $USER->timezone : 99;
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} else if (is_object($userorforcedtz)) {
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$tz = isset($userorforcedtz->timezone) ? $userorforcedtz->timezone : 99;
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} else {
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if ($userorforcedtz == 99) {
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$tz = isset($USER->timezone) ? $USER->timezone : 99;
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} else {
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$tz = $userorforcedtz;
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}
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}
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if ($tz == 99) {
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return self::get_server_timezone();
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}
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return self::normalise_timezone($tz);
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}
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/**
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* Return user timezone object.
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*
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* @param mixed $userorforcedtz
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* @return DateTimeZone
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*/
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public static function get_user_timezone_object($userorforcedtz = null) {
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$tz = self::get_user_timezone($userorforcedtz);
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return new DateTimeZone($tz);
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}
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/**
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* Return default timezone set in php.ini or config.php.
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* @return string normalised timezone compatible with PHP
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*/
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public static function get_default_php_timezone() {
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if (!isset(self::$defaultphptimezone)) {
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// This should not happen.
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self::store_default_php_timezone();
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}
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return self::$defaultphptimezone;
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}
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/**
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* To be called from lib/setup.php only!
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*/
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public static function store_default_php_timezone() {
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if ((defined('PHPUNIT_TEST') and PHPUNIT_TEST)
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or defined('BEHAT_SITE_RUNNING') or defined('BEHAT_TEST') or defined('BEHAT_UTIL')) {
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// We want all test sites to be consistent by default.
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self::$defaultphptimezone = 'Australia/Perth';
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return;
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}
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if (!isset(self::$defaultphptimezone)) {
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self::$defaultphptimezone = date_default_timezone_get();
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}
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}
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/**
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* Do not use directly - use $this->setTimezone('xx', $tz) instead in your test case.
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* @param string $tz valid timezone name
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*/
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public static function phpunit_override_default_php_timezone($tz) {
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if (!defined('PHPUNIT_TEST')) {
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throw new coding_exception('core_date::phpunit_override_default_php_timezone() must be used only from unit tests');
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}
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$result = timezone_open($tz); // This triggers error if $tz invalid.
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if ($result !== false) {
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self::$defaultphptimezone = $tz;
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} else {
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self::$defaultphptimezone = 'Australia/Perth';
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}
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}
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/**
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* To be called from phpunit reset only, after restoring $CFG.
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*/
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public static function phpunit_reset() {
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global $CFG;
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if (!defined('PHPUNIT_TEST')) {
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throw new coding_exception('core_date::phpunit_reset() must be used only from unit tests');
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}
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self::store_default_php_timezone();
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date_default_timezone_set($CFG->timezone);
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}
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/**
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* Initialise timezone arrays, call before use.
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*/
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protected static function init_zones() {
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if (isset(self::$goodzones)) {
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return;
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}
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$zones = DateTimeZone::listIdentifiers();
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self::$goodzones = array_fill_keys($zones, true);
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$zones = DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC);
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self::$bczones = array();
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foreach ($zones as $zone) {
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if (isset(self::$goodzones[$zone])) {
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continue;
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}
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self::$bczones[$zone] = true;
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}
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self::$badzones = array(
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// Windows time zones.
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'Dateline Standard Time' => 'Etc/GMT+12',
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'Hawaiian Standard Time' => 'Pacific/Honolulu',
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'Alaskan Standard Time' => 'America/Anchorage',
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'Pacific Standard Time (Mexico)' => 'America/Santa_Isabel',
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'Pacific Standard Time' => 'America/Los_Angeles',
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'US Mountain Standard Time' => 'America/Phoenix',
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'Mountain Standard Time (Mexico)' => 'America/Chihuahua',
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'Mountain Standard Time' => 'America/Denver',
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'Central America Standard Time' => 'America/Guatemala',
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'Central Standard Time' => 'America/Chicago',
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||
|
|
'Central Standard Time (Mexico)' => 'America/Mexico_City',
|
||
|
|
'Canada Central Standard Time' => 'America/Regina',
|
||
|
|
'SA Pacific Standard Time' => 'America/Bogota',
|
||
|
|
'Eastern Standard Time' => 'America/New_York',
|
||
|
|
'US Eastern Standard Time' => 'America/Indianapolis',
|
||
|
|
'Venezuela Standard Time' => 'America/Caracas',
|
||
|
|
'Paraguay Standard Time' => 'America/Asuncion',
|
||
|
|
'Atlantic Standard Time' => 'America/Halifax',
|
||
|
|
'Central Brazilian Standard Time' => 'America/Cuiaba',
|
||
|
|
'SA Western Standard Time' => 'America/La_Paz',
|
||
|
|
'Pacific SA Standard Time' => 'America/Santiago',
|
||
|
|
'Newfoundland Standard Time' => 'America/St_Johns',
|
||
|
|
'E. South America Standard Time' => 'America/Sao_Paulo',
|
||
|
|
'Argentina Standard Time' => 'America/Buenos_Aires',
|
||
|
|
'SA Eastern Standard Time' => 'America/Cayenne',
|
||
|
|
'Greenland Standard Time' => 'America/Godthab',
|
||
|
|
'Montevideo Standard Time' => 'America/Montevideo',
|
||
|
|
'Bahia Standard Time' => 'America/Bahia',
|
||
|
|
'Azores Standard Time' => 'Atlantic/Azores',
|
||
|
|
'Cape Verde Standard Time' => 'Atlantic/Cape_Verde',
|
||
|
|
'Morocco Standard Time' => 'Africa/Casablanca',
|
||
|
|
'GMT Standard Time' => 'Europe/London',
|
||
|
|
'Greenwich Standard Time' => 'Atlantic/Reykjavik',
|
||
|
|
'W. Europe Standard Time' => 'Europe/Berlin',
|
||
|
|
'Central Europe Standard Time' => 'Europe/Budapest',
|
||
|
|
'Romance Standard Time' => 'Europe/Paris',
|
||
|
|
'Central European Standard Time' => 'Europe/Warsaw',
|
||
|
|
'W. Central Africa Standard Time' => 'Africa/Lagos',
|
||
|
|
'Namibia Standard Time' => 'Africa/Windhoek',
|
||
|
|
'Jordan Standard Time' => 'Asia/Amman',
|
||
|
|
'GTB Standard Time' => 'Europe/Bucharest',
|
||
|
|
'Middle East Standard Time' => 'Asia/Beirut',
|
||
|
|
'Egypt Standard Time' => 'Africa/Cairo',
|
||
|
|
'Syria Standard Time' => 'Asia/Damascus',
|
||
|
|
'South Africa Standard Time' => 'Africa/Johannesburg',
|
||
|
|
'FLE Standard Time' => 'Europe/Kiev',
|
||
|
|
'Turkey Standard Time' => 'Europe/Istanbul',
|
||
|
|
'Israel Standard Time' => 'Asia/Jerusalem',
|
||
|
|
'Kaliningrad Standard Time' => 'Europe/Kaliningrad',
|
||
|
|
'Libya Standard Time' => 'Africa/Tripoli',
|
||
|
|
'Arabic Standard Time' => 'Asia/Baghdad',
|
||
|
|
'Arab Standard Time' => 'Asia/Riyadh',
|
||
|
|
'Belarus Standard Time' => 'Europe/Minsk',
|
||
|
|
'Russian Standard Time' => 'Europe/Moscow',
|
||
|
|
'E. Africa Standard Time' => 'Africa/Nairobi',
|
||
|
|
'Iran Standard Time' => 'Asia/Tehran',
|
||
|
|
'Arabian Standard Time' => 'Asia/Dubai',
|
||
|
|
'Azerbaijan Standard Time' => 'Asia/Baku',
|
||
|
|
'Russia Time Zone 3' => 'Europe/Samara',
|
||
|
|
'Mauritius Standard Time' => 'Indian/Mauritius',
|
||
|
|
'Georgian Standard Time' => 'Asia/Tbilisi',
|
||
|
|
'Caucasus Standard Time' => 'Asia/Yerevan',
|
||
|
|
'Afghanistan Standard Time' => 'Asia/Kabul',
|
||
|
|
'West Asia Standard Time' => 'Asia/Tashkent',
|
||
|
|
'Ekaterinburg Standard Time' => 'Asia/Yekaterinburg',
|
||
|
|
'Pakistan Standard Time' => 'Asia/Karachi',
|
||
|
|
'India Standard Time' => 'Asia/Kolkata', // PHP and Windows differ in spelling.
|
||
|
|
'Sri Lanka Standard Time' => 'Asia/Colombo',
|
||
|
|
'Nepal Standard Time' => 'Asia/Katmandu',
|
||
|
|
'Central Asia Standard Time' => 'Asia/Almaty',
|
||
|
|
'Bangladesh Standard Time' => 'Asia/Dhaka',
|
||
|
|
'N. Central Asia Standard Time' => 'Asia/Novosibirsk',
|
||
|
|
'Myanmar Standard Time' => 'Asia/Rangoon',
|
||
|
|
'SE Asia Standard Time' => 'Asia/Bangkok',
|
||
|
|
'North Asia Standard Time' => 'Asia/Krasnoyarsk',
|
||
|
|
'China Standard Time' => 'Asia/Shanghai',
|
||
|
|
'North Asia East Standard Time' => 'Asia/Irkutsk',
|
||
|
|
'Singapore Standard Time' => 'Asia/Singapore',
|
||
|
|
'W. Australia Standard Time' => 'Australia/Perth',
|
||
|
|
'Taipei Standard Time' => 'Asia/Taipei',
|
||
|
|
'Ulaanbaatar Standard Time' => 'Asia/Ulaanbaatar',
|
||
|
|
'Tokyo Standard Time' => 'Asia/Tokyo',
|
||
|
|
'Korea Standard Time' => 'Asia/Seoul',
|
||
|
|
'Yakutsk Standard Time' => 'Asia/Yakutsk',
|
||
|
|
'Cen. Australia Standard Time' => 'Australia/Adelaide',
|
||
|
|
'AUS Central Standard Time' => 'Australia/Darwin',
|
||
|
|
'E. Australia Standard Time' => 'Australia/Brisbane',
|
||
|
|
'AUS Eastern Standard Time' => 'Australia/Sydney',
|
||
|
|
'West Pacific Standard Time' => 'Pacific/Port_Moresby',
|
||
|
|
'Tasmania Standard Time' => 'Australia/Hobart',
|
||
|
|
'Magadan Standard Time' => 'Asia/Magadan',
|
||
|
|
'Vladivostok Standard Time' => 'Asia/Vladivostok',
|
||
|
|
'Russia Time Zone 10' => 'Asia/Srednekolymsk',
|
||
|
|
'Central Pacific Standard Time' => 'Pacific/Guadalcanal',
|
||
|
|
'Russia Time Zone 11' => 'Asia/Kamchatka',
|
||
|
|
'New Zealand Standard Time' => 'Pacific/Auckland',
|
||
|
|
'Fiji Standard Time' => 'Pacific/Fiji',
|
||
|
|
'Tonga Standard Time' => 'Pacific/Tongatapu',
|
||
|
|
'Samoa Standard Time' => 'Pacific/Apia',
|
||
|
|
'Line Islands Standard Time' => 'Pacific/Kiritimati',
|
||
|
|
|
||
|
|
// A lot more bad legacy time zones.
|
||
|
|
'CET' => 'Europe/Berlin',
|
||
|
|
'Central European Time' => 'Europe/Berlin',
|
||
|
|
'CST' => 'America/Chicago',
|
||
|
|
'Central Time' => 'America/Chicago',
|
||
|
|
'CST6CDT' => 'America/Chicago',
|
||
|
|
'CDT' => 'America/Chicago',
|
||
|
|
'China Time' => 'Asia/Shanghai',
|
||
|
|
'EDT' => 'America/New_York',
|
||
|
|
'EST' => 'America/New_York',
|
||
|
|
'EST5EDT' => 'America/New_York',
|
||
|
|
'Eastern Time' => 'America/New_York',
|
||
|
|
'IST' => 'Asia/Kolkata',
|
||
|
|
'India Time' => 'Asia/Kolkata',
|
||
|
|
'JST' => 'Asia/Tokyo',
|
||
|
|
'Japan Time' => 'Asia/Tokyo',
|
||
|
|
'Japan Standard Time' => 'Asia/Tokyo',
|
||
|
|
'MDT' => 'America/Denver',
|
||
|
|
'MST' => 'America/Denver',
|
||
|
|
'MST7MDT' => 'America/Denver',
|
||
|
|
'PDT' => 'America/Los_Angeles',
|
||
|
|
'PST' => 'America/Los_Angeles',
|
||
|
|
'Pacific Time' => 'America/Los_Angeles',
|
||
|
|
'PST8PDT' => 'America/Los_Angeles',
|
||
|
|
'HST' => 'Pacific/Honolulu',
|
||
|
|
'WET' => 'Europe/London',
|
||
|
|
'EET' => 'Europe/Kiev',
|
||
|
|
'FET' => 'Europe/Minsk',
|
||
|
|
|
||
|
|
// Some UTC variations.
|
||
|
|
'UTC-01' => 'Etc/GMT+1',
|
||
|
|
'UTC-02' => 'Etc/GMT+2',
|
||
|
|
'UTC-03' => 'Etc/GMT+3',
|
||
|
|
'UTC-04' => 'Etc/GMT+4',
|
||
|
|
'UTC-05' => 'Etc/GMT+5',
|
||
|
|
'UTC-06' => 'Etc/GMT+6',
|
||
|
|
'UTC-07' => 'Etc/GMT+7',
|
||
|
|
'UTC-08' => 'Etc/GMT+8',
|
||
|
|
'UTC-09' => 'Etc/GMT+9',
|
||
|
|
|
||
|
|
// Some weird GMTs.
|
||
|
|
'Etc/GMT+0' => 'Etc/GMT',
|
||
|
|
'Etc/GMT-0' => 'Etc/GMT',
|
||
|
|
'Etc/GMT0' => 'Etc/GMT',
|
||
|
|
|
||
|
|
// And lastly some alternative city spelling.
|
||
|
|
'Asia/Calcutta' => 'Asia/Kolkata',
|
||
|
|
);
|
||
|
|
|
||
|
|
// Legacy GMT fallback.
|
||
|
|
for ($i = -12; $i <= 14; $i++) {
|
||
|
|
$off = abs($i);
|
||
|
|
if ($i < 0) {
|
||
|
|
$mapto = 'Etc/GMT+' . $off;
|
||
|
|
$utc = 'UTC-' . $off;
|
||
|
|
$gmt = 'GMT-' . $off;
|
||
|
|
} else if ($i > 0) {
|
||
|
|
$mapto = 'Etc/GMT-' . $off;
|
||
|
|
$utc = 'UTC+' . $off;
|
||
|
|
$gmt = 'GMT+' . $off;
|
||
|
|
} else {
|
||
|
|
$mapto = 'Etc/GMT';
|
||
|
|
$utc = 'UTC';
|
||
|
|
$gmt = 'GMT';
|
||
|
|
}
|
||
|
|
if (isset(self::$bczones[$mapto])) {
|
||
|
|
self::$badzones[$i . ''] = $mapto;
|
||
|
|
self::$badzones[$i . '.0'] = $mapto;
|
||
|
|
self::$badzones[$utc] = $mapto;
|
||
|
|
self::$badzones[$gmt] = $mapto;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Legacy Moodle half an hour offsets - pick any city nearby, ideally without DST.
|
||
|
|
self::$badzones['4.5'] = 'Asia/Kabul';
|
||
|
|
self::$badzones['5.5'] = 'Asia/Kolkata';
|
||
|
|
self::$badzones['6.5'] = 'Asia/Rangoon';
|
||
|
|
self::$badzones['9.5'] = 'Australia/Darwin';
|
||
|
|
|
||
|
|
// Remove bad zones that are elsewhere.
|
||
|
|
foreach (self::$bczones as $zone => $unused) {
|
||
|
|
if (isset(self::$badzones[$zone])) {
|
||
|
|
unset(self::$badzones[$zone]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
foreach (self::$goodzones as $zone => $unused) {
|
||
|
|
if (isset(self::$badzones[$zone])) {
|
||
|
|
unset(self::$badzones[$zone]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|