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101 lines
2.5 KiB
101 lines
2.5 KiB
<?php declare(strict_types = 0);
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program 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 2 of the License, or
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** (at your option) any later version.
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**
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** This program 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 this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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class CTimezoneHelper {
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/**
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* Get list of supported timezones.
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* Example: ["Europe/London" => "(UTC+00:00) Europe/London", ...]
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*
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* @return array
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*/
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public static function getList(): array {
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static $timezones;
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if ($timezones === null) {
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$timezones = [];
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foreach (DateTimeZone::listIdentifiers() as $timezone) {
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$offset = (new DateTimeZone($timezone))->getOffset(new DateTime());
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$timezones[$timezone] = [
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'offset' => $offset,
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'timezone' => $timezone,
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'title' => '(UTC'.($offset < 0 ? '-' : '+').gmdate('H:i', abs($offset)).') '.$timezone
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];
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}
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CArrayHelper::sort($timezones, ['offset', 'timezone']);
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$timezones = array_column($timezones, 'title', 'timezone');
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}
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return $timezones;
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}
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/**
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* Get timezone title, optionally prefixed.
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*
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* @param string $timezone
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* @param string|null $prefix
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*
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* @return string
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*/
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public static function getTitle(string $timezone, string $prefix = null): string {
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$timezone_title = self::getList()[$timezone];
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if ($prefix === null) {
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return $timezone_title;
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}
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return $prefix.': '.$timezone_title;
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}
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/**
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* Is timezone supported?
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*
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* @param string $timezone
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*
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* @return bool
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*/
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public static function isSupported(string $timezone): bool {
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return array_key_exists($timezone, self::getList());
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}
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/**
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* Get system timezone.
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* Example: "Europe/London"
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*
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* @return string
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*/
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public static function getSystemTimezone(): string {
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$system_timezone_lower = strtolower(ini_get('date.timezone'));
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foreach (array_keys(self::getList()) as $timezone) {
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if ($system_timezone_lower === strtolower($timezone)) {
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return $timezone;
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}
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}
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return 'UTC';
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}
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}
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