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<?php namespace PhpOffice\PhpSpreadsheet\Shared; use DateTimeZone; use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException; /** * Copyright (c) 2006 - 2016 PhpSpreadsheet. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * @category PhpSpreadsheet * * @copyright Copyright (c) 2006 - 2016 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL */ class TimeZone { /* * Default Timezone used for date/time conversions * * @private * @var string */ protected static $timezone = 'UTC'; /** * Validate a Timezone name. * * @param string $timezone Time zone (e.g. 'Europe/London') * * @return bool Success or failure */ private static function validateTimeZone($timezone) { if (in_array($timezone, DateTimeZone::listIdentifiers())) { return true; } return false; } /** * Set the Default Timezone used for date/time conversions. * * @param string $timezone Time zone (e.g. 'Europe/London') * * @return bool Success or failure */ public static function setTimeZone($timezone) { if (self::validateTimezone($timezone)) { self::$timezone = $timezone; return true; } return false; } /** * Return the Default Timezone used for date/time conversions. * * @return string Timezone (e.g. 'Europe/London') */ public static function getTimeZone() { return self::$timezone; } /** * Return the Timezone offset used for date/time conversions to/from UST * This requires both the timezone and the calculated date/time to allow for local DST. * * @param string $timezone The timezone for finding the adjustment to UST * @param int $timestamp PHP date/time value * * @throws PhpSpreadsheetException * * @return int Number of seconds for timezone adjustment */ public static function getTimeZoneAdjustment($timezone, $timestamp) { if ($timezone !== null) { if (!self::validateTimezone($timezone)) { throw new PhpSpreadsheetException('Invalid timezone ' . $timezone); } } else { $timezone = self::$timezone; } if ($timezone == 'UST') { return 0; } $objTimezone = new DateTimeZone($timezone); $transitions = $objTimezone->getTransitions($timestamp, $timestamp); return (count($transitions) > 0) ? $transitions[0]['offset'] : 0; } }
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