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<?php |
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namespace PhpOffice\PhpSpreadsheet\Shared; |
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/** |
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* Copyright (c) 2006 - 2016 PhpSpreadsheet |
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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 PhpSpreadsheet |
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* @copyright Copyright (c) 2006 - 2016 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet) |
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL |
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*/ |
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class 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 $timezone Time zone (e.g. 'Europe/London') |
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* @return bool Success or failure |
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*/ |
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private static function validateTimeZone($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 $timezone Time zone (e.g. 'Europe/London') |
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* @return bool Success or failure |
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*/ |
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public static function setTimeZone($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 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 int $timestamp PHP date/time value |
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* @throws \PhpOffice\PhpSpreadsheet\Exception |
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* @return int Number of seconds for timezone adjustment |
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*/ |
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public static function getTimeZoneAdjustment($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 \PhpOffice\PhpSpreadsheet\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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$transitions = $objTimezone->getTransitions($timestamp, $timestamp); |
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return (count($transitions) > 0) ? $transitions[0]['offset'] : 0; |
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} |
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} |
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PHPOffice /
PhpSpreadsheet
