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<?php |
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/** |
* PHPExcel |
* |
* Copyright (c) 2006 - 2013 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 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel) |
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL |
* @version ##VERSION##, ##DATE## |
*/ |
|
|
/** |
* PHPExcel_Shared_TimeZone |
* |
* @category PHPExcel |
* @package PHPExcel_Shared |
* @copyright Copyright (c) 2006 - 2013 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; |
} |
|
} |