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<?php declare(strict_types = 0);
/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/
class CTimezoneHelper {
/**
* Get list of supported timezones.
* Example: ["Europe/London" => "(UTC+00:00) Europe/London", ...]
*
* @return array
*/
public static function getList(): array {
static $timezones;
if ($timezones === null) {
$timezones = [];
foreach (DateTimeZone::listIdentifiers() as $timezone) {
$offset = (new DateTimeZone($timezone))->getOffset(new DateTime());
$timezones[$timezone] = [
'offset' => $offset,
'timezone' => $timezone,
'title' => '(UTC'.($offset < 0 ? '-' : '+').gmdate('H:i', abs($offset)).') '.$timezone
];
}
CArrayHelper::sort($timezones, ['offset', 'timezone']);
$timezones = array_column($timezones, 'title', 'timezone');
}
return $timezones;
}
/**
* Get timezone title, optionally prefixed.
*
* @param string $timezone
* @param string|null $prefix
*
* @return string
*/
public static function getTitle(string $timezone, ?string $prefix = null): string {
$timezone_title = self::getList()[$timezone];
if ($prefix === null) {
return $timezone_title;
}
return $prefix.': '.$timezone_title;
}
/**
* Is timezone supported?
*
* @param string $timezone
*
* @return bool
*/
public static function isSupported(string $timezone): bool {
return array_key_exists($timezone, self::getList());
}
/**
* Get system timezone.
* Example: "Europe/London"
*
* @return string
*/
public static function getSystemTimezone(): string {
$system_timezone_lower = strtolower(ini_get('date.timezone'));
foreach (array_keys(self::getList()) as $timezone) {
if ($system_timezone_lower === strtolower($timezone)) {
return $timezone;
}
}
return 'UTC';
}
}
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