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extend/phpexcel/PHPExcel/Shared/TimeZone.php

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+<?php
+
+/**
+ * PHPExcel
+ *
+ * Copyright (c) 2006 - 2014 PHPExcel
+ *
+ * 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   PHPExcel
+ * @package	PHPExcel_Shared
+ * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version	1.8.0, 2014-03-02
+ */
+
+
+/**
+ * PHPExcel_Shared_TimeZone
+ *
+ * @category   PHPExcel
+ * @package	PHPExcel_Shared
+ * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_Shared_TimeZone
+{
+	/*
+	 * Default Timezone used for date/time conversions
+	 *
+	 * @private
+	 * @var	string
+	 */
+	protected static $_timezone	= 'UTC';
+
+	/**
+	 * Validate a Timezone name
+	 *
+	 * @param	 string		$timezone			Time zone (e.g. 'Europe/London')
+	 * @return	 boolean						Success or failure
+	 */
+	public static function _validateTimeZone($timezone) {
+		if (in_array($timezone, DateTimeZone::listIdentifiers())) {
+			return TRUE;
+		}
+		return FALSE;
+	}
+
+	/**
+	 * Set the Default Timezone used for date/time conversions
+	 *
+	 * @param	 string		$timezone			Time zone (e.g. 'Europe/London')
+	 * @return	 boolean						Success or failure
+	 */
+	public static function setTimeZone($timezone) {
+		if (self::_validateTimezone($timezone)) {
+			self::$_timezone = $timezone;
+			return TRUE;
+		}
+		return FALSE;
+	}	//	function setTimezone()
+
+
+	/**
+	 * Return the Default Timezone used for date/time conversions
+	 *
+	 * @return	 string		Timezone (e.g. 'Europe/London')
+	 */
+	public static function getTimeZone() {
+		return self::$_timezone;
+	}	//	function getTimezone()
+
+
+	/**
+	 *	Return the Timezone transition for the specified timezone and timestamp
+	 *
+	 *	@param		DateTimeZone	 	$objTimezone	The timezone for finding the transitions
+	 *	@param		integer	 			$timestamp		PHP date/time value for finding the current transition
+	 *	@return	 	array				The current transition details
+	 */
+	private static function _getTimezoneTransitions($objTimezone, $timestamp) {
+		$allTransitions = $objTimezone->getTransitions();
+		$transitions = array();
+		foreach($allTransitions as $key => $transition) {
+			if ($transition['ts'] > $timestamp) {
+				$transitions[] = ($key > 0) ? $allTransitions[$key - 1] : $transition;
+				break;
+			}
+			if (empty($transitions)) {
+				$transitions[] = end($allTransitions);
+			}
+		}
+
+		return $transitions;
+	}
+
+	/**
+	 *	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		integer	 			$timestamp		PHP date/time value
+	 *	@return	 	integer				Number of seconds for timezone adjustment
+	 *	@throws		PHPExcel_Exception
+	 */
+	public static function getTimeZoneAdjustment($timezone, $timestamp) {
+		if ($timezone !== NULL) {
+			if (!self::_validateTimezone($timezone)) {
+				throw new PHPExcel_Exception("Invalid timezone " . $timezone);
+			}
+		} else {
+			$timezone = self::$_timezone;
+		}
+
+		if ($timezone == 'UST') {
+			return 0;
+		}
+
+		$objTimezone = new DateTimeZone($timezone);
+		if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
+			$transitions = $objTimezone->getTransitions($timestamp,$timestamp);
+		} else {
+			$transitions = self::_getTimezoneTransitions($objTimezone, $timestamp);
+		}
+
+		return (count($transitions) > 0) ? $transitions[0]['offset'] : 0;
+	}
+
+}