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<?php
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/**
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* PHPExcel
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*
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* Copyright (c) 2006 - 2013 PHPExcel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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* @category PHPExcel
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* @package PHPExcel_Shared
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* @copyright Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version ##VERSION##, ##DATE##
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*/
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/**
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* PHPExcel_Shared_TimeZone
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*
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* @category PHPExcel
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* @package PHPExcel_Shared
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* @copyright Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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*/
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class PHPExcel_Shared_TimeZone
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{
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/*
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* Default Timezone used for date/time conversions
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*
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* @private
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* @var string
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*/
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protected static $_timezone = 'UTC';
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/**
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* Validate a Timezone name
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*
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* @param string $timezone Time zone (e.g. 'Europe/London')
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* @return boolean Success or failure
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*/
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public static function _validateTimeZone($timezone) {
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if (in_array($timezone, DateTimeZone::listIdentifiers())) {
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Set the Default Timezone used for date/time conversions
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*
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* @param string $timezone Time zone (e.g. 'Europe/London')
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* @return boolean Success or failure
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*/
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public static function setTimeZone($timezone) {
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if (self::_validateTimezone($timezone)) {
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self::$_timezone = $timezone;
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return TRUE;
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}
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return FALSE;
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} // function setTimezone()
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/**
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* Return the Default Timezone used for date/time conversions
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*
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* @return string Timezone (e.g. 'Europe/London')
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*/
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public static function getTimeZone() {
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return self::$_timezone;
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} // function getTimezone()
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/**
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* Return the Timezone transition for the specified timezone and timestamp
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*
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* @param DateTimeZone $objTimezone The timezone for finding the transitions
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* @param integer $timestamp PHP date/time value for finding the current transition
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* @return array The current transition details
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*/
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private static function _getTimezoneTransitions($objTimezone, $timestamp) {
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$allTransitions = $objTimezone->getTransitions();
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$transitions = array();
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foreach($allTransitions as $key => $transition) {
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if ($transition['ts'] > $timestamp) {
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$transitions[] = ($key > 0) ? $allTransitions[$key - 1] : $transition;
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break;
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}
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if (empty($transitions)) {
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$transitions[] = end($allTransitions);
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}
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}
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return $transitions;
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}
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/**
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* Return the Timezone offset used for date/time conversions to/from UST
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* This requires both the timezone and the calculated date/time to allow for local DST
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*
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* @param string $timezone The timezone for finding the adjustment to UST
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* @param integer $timestamp PHP date/time value
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* @return integer Number of seconds for timezone adjustment
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* @throws PHPExcel_Exception
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*/
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public static function getTimeZoneAdjustment($timezone, $timestamp) {
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if ($timezone !== NULL) {
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if (!self::_validateTimezone($timezone)) {
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throw new PHPExcel_Exception("Invalid timezone " . $timezone);
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}
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} else {
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$timezone = self::$_timezone;
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}
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if ($timezone == 'UST') {
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return 0;
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}
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$objTimezone = new DateTimeZone($timezone);
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if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
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$transitions = $objTimezone->getTransitions($timestamp,$timestamp);
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} else {
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$transitions = self::_getTimezoneTransitions($objTimezone, $timestamp);
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}
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return (count($transitions) > 0) ? $transitions[0]['offset'] : 0;
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}
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}
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