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144 lines
4.7 KiB
144 lines
4.7 KiB
<?php |
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/** |
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* PHPExcel |
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* |
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* Copyright (c) 2006 - 2015 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 - 2015 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 - 2015 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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{ |
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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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{ |
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if (self::_validateTimezone($timezone)) { |
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self::$timezone = $timezone; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Return the Default Timezone used for date/time conversions |
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* |
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* @return string Timezone (e.g. 'Europe/London') |
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*/ |
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public static function getTimeZone() |
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{ |
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return self::$timezone; |
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} |
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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, $timestamp) |
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{ |
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$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, $timestamp) |
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{ |
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if ($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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