Zabbix

<?php

/*

** Zabbix

** 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 General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

/**

 * Date and time helper.

 */

class CDateTimeHelper {

​

    /**

     * Check if time zone observe the daylight saving time.

     *

     * @param string $timezone      time-zone name

     *

     * @return boolean

     */

    public static function isDaylightSavingTime($timezone) {

        $zone = new DateTimeZone($timezone);

        $time = time();

        $transition = $zone->getTransitions($time, $time);

​

        return $transition[0]['isdst'];

    }

​

    /**

     * Get the UTC offset for a specific time zone.

     *

     * @param string $timezone      time-zone name

     *

     * @return string

     */

    public static function getUTCOffset($timezone) {

        $offset = (strtotime('now UTC') - strtotime('now '.$timezone));

        $sign = $offset >= 0 ? '+' : '-';

        $offset = abs($offset);

​

        return sprintf('UTC%s%02d:%02d', $sign, $offset / 3600, ($offset / 60) % 60);

    }

​

    /**

     * Get time zone with UTC time usable as label in time-zone drop-downs.

     *

     * @param string $label     time zone name or default value of time-zone dropdown

     *

     * @return string

     */

    public static function getTimeZoneFormat($label) {