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104 lines
3.0 KiB
104 lines
3.0 KiB
1 year ago
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<?php
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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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/**
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* Date and time helper.
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*/
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class CDateTimeHelper {
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/**
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* Check if time zone observe the daylight saving time.
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*
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* @param string $timezone time-zone name
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*
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* @return boolean
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*/
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public static function isDaylightSavingTime($timezone) {
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$zone = new DateTimeZone($timezone);
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$time = time();
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$transition = $zone->getTransitions($time, $time);
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return $transition[0]['isdst'];
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}
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/**
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* Get the UTC offset for a specific time zone.
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*
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* @param string $timezone time-zone name
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*
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* @return string
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*/
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public static function getUTCOffset($timezone) {
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$offset = (strtotime('now UTC') - strtotime('now '.$timezone));
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$sign = $offset >= 0 ? '+' : '-';
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$offset = abs($offset);
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return sprintf('UTC%s%02d:%02d', $sign, $offset / 3600, ($offset / 60) % 60);
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}
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/**
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* Get time zone with UTC time usable as label in time-zone drop-downs.
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*
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* @param string $label time zone name or default value of time-zone dropdown
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*
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* @return string
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*/
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public static function getTimeZoneFormat($label) {
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$timezone = ($label === 'System' || $label === 'System default') ? 'Europe/Riga' : $label;
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$utc = CDateTimeHelper::getUTCOffset($timezone);
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return (($label === 'System' || $label === 'System default') ? $label .': ': '').'('.$utc.') '.$timezone;
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}
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/**
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* The days are counted from specific date and time period.
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*
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* @param string $date timestamp
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* @param string $period time period
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*
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* @return int
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*/
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public static function countDays($date = 'now', $period = 'P1Y') {
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$to = new DateTime($date);
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$from = (clone $to)->sub(new DateInterval($period));
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return $from->diff($to)->days;
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}
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/**
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* Get the time difference in months between two moments in time.
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*
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* @param string|int $from timestamp or string that represents the oldest moments in time
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* @param string|int $to timestamp or string that represents the newest moments in time
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*
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* @return int
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*/
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public static function countMonthsBetweenDates($from, $to = 'now') {
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foreach ([&$from, &$to] as &$moment) {
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if (is_string($moment)) {
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$moment = strtotime($moment);
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}
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}
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unset($moment);
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return ((date('Y', $to) - date('Y', $from)) * 12) + ((date('m', $to) - date('m', $from)));
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}
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}
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