<?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_Calculation

 * @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 root directory */

if (!defined('PHPEXCEL_ROOT')) {

	/**

	 * @ignore

	 */

	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');

	require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');

}





/**

 * PHPExcel_Calculation_DateTime

 *

 * @category	PHPExcel

 * @package		PHPExcel_Calculation

 * @copyright	Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)

 */

class PHPExcel_Calculation_DateTime {



	/**

	 * Identify if a year is a leap year or not

	 *

	 * @param	integer	$year	The year to test

	 * @return	boolean			TRUE if the year is a leap year, otherwise FALSE

	 */

	public static function _isLeapYear($year) {

		return ((($year % 4) == 0) && (($year % 100) != 0) || (($year % 400) == 0));

	}	//	function _isLeapYear()





	/**

	 * Return the number of days between two dates based on a 360 day calendar

	 *

	 * @param	integer	$startDay		Day of month of the start date

	 * @param	integer	$startMonth		Month of the start date

	 * @param	integer	$startYear		Year of the start date

	 * @param	integer	$endDay			Day of month of the start date

	 * @param	integer	$endMonth		Month of the start date

	 * @param	integer	$endYear		Year of the start date

	 * @param	boolean $methodUS		Whether to use the US method or the European method of calculation

	 * @return	integer	Number of days between the start date and the end date

	 */

	private static function _dateDiff360($startDay, $startMonth, $startYear, $endDay, $endMonth, $endYear, $methodUS) {

		if ($startDay == 31) {

			--$startDay;

		} elseif ($methodUS && ($startMonth == 2 && ($startDay == 29 || ($startDay == 28 && !self::_isLeapYear($startYear))))) {

			$startDay = 30;

		}

		if ($endDay == 31) {

			if ($methodUS && $startDay != 30) {

				$endDay = 1;

				if ($endMonth == 12) {

					++$endYear;

					$endMonth = 1;

				} else {

					++$endMonth;

				}

			} else {

				$endDay = 30;

			}

		}



		return $endDay + $endMonth * 30 + $endYear * 360 - $startDay - $startMonth * 30 - $startYear * 360;

	}	//	function _dateDiff360()





	/**

	 * _getDateValue

	 *

	 * @param	string	$dateValue

	 * @return	mixed	Excel date/time serial value, or string if error

	 */

	public static function _getDateValue($dateValue) {

		if (!is_numeric($dateValue)) {

			if ((is_string($dateValue)) &&

				(PHPExcel_Calculation_Functions::getCompatibilityMode() == PHPExcel_Calculation_Functions::COMPATIBILITY_GNUMERIC)) {

				return PHPExcel_Calculation_Functions::VALUE();

			}

			if ((is_object($dateValue)) && ($dateValue instanceof DateTime)) {

				$dateValue = PHPExcel_Shared_Date::PHPToExcel($dateValue);

			} else {

				$saveReturnDateType = PHPExcel_Calculation_Functions::getReturnDateType();

				PHPExcel_Calculation_Functions::setReturnDateType(PHPExcel_Calculation_Functions::RETURNDATE_EXCEL);

				$dateValue = self::DATEVALUE($dateValue);

				PHPExcel_Calculation_Functions::setReturnDateType($saveReturnDateType);

			}

		}

		return $dateValue;

	}	//	function _getDateValue()





	/**

	 * _getTimeValue

	 *

	 * @param	string	$timeValue

	 * @return	mixed	Excel date/time serial value, or string if error

	 */

	private static function _getTimeValue($timeValue) {

		$saveReturnDateType = PHPExcel_Calculation_Functions::getReturnDateType();

		PHPExcel_Calculation_Functions::setReturnDateType(PHPExcel_Calculation_Functions::RETURNDATE_EXCEL);

		$timeValue = self::TIMEVALUE($timeValue);

		PHPExcel_Calculation_Functions::setReturnDateType($saveReturnDateType);

		return $timeValue;

	}	//	function _getTimeValue()





	private static function _adjustDateByMonths($dateValue = 0, $adjustmentMonths = 0) {

		// Execute function

		$PHPDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($dateValue);

		$oMonth = (int) $PHPDateObject->format('m');

		$oYear = (int) $PHPDateObject->format('Y');



		$adjustmentMonthsString = (string) $adjustmentMonths;

		if ($adjustmentMonths > 0) {

			$adjustmentMonthsString = '+'.$adjustmentMonths;

		}

		if ($adjustmentMonths != 0) {

			$PHPDateObject->modify($adjustmentMonthsString.' months');

		}

		$nMonth = (int) $PHPDateObject->format('m');

		$nYear = (int) $PHPDateObject->format('Y');



		$monthDiff = ($nMonth - $oMonth) + (($nYear - $oYear) * 12);

		if ($monthDiff != $adjustmentMonths) {

			$adjustDays = (int) $PHPDateObject->format('d');

			$adjustDaysString = '-'.$adjustDays.' days';

			$PHPDateObject->modify($adjustDaysString);

		}

		return $PHPDateObject;

	}	//	function _adjustDateByMonths()





	/**

	 * DATETIMENOW

	 *

	 * Returns the current date and time.

	 * The NOW function is useful when you need to display the current date and time on a worksheet or

	 * calculate a value based on the current date and time, and have that value updated each time you

	 * open the worksheet.

	 *

	 * NOTE: When used in a Cell Formula, MS Excel changes the cell format so that it matches the date

	 * and time format of your regional settings. PHPExcel does not change cell formatting in this way.

	 *

	 * Excel Function:

	 *		NOW()

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function DATETIMENOW() {

		$saveTimeZone = date_default_timezone_get();

		date_default_timezone_set('UTC');

		$retValue = False;

		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					$retValue = (float) PHPExcel_Shared_Date::PHPToExcel(time());

					break;

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					$retValue = (integer) time();

					break;

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					$retValue = new DateTime();

					break;

		}

		date_default_timezone_set($saveTimeZone);



		return $retValue;

	}	//	function DATETIMENOW()





	/**

	 * DATENOW

	 *

	 * Returns the current date.

	 * The NOW function is useful when you need to display the current date and time on a worksheet or

	 * calculate a value based on the current date and time, and have that value updated each time you

	 * open the worksheet.

	 *

	 * NOTE: When used in a Cell Formula, MS Excel changes the cell format so that it matches the date

	 * and time format of your regional settings. PHPExcel does not change cell formatting in this way.

	 *

	 * Excel Function:

	 *		TODAY()

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function DATENOW() {

		$saveTimeZone = date_default_timezone_get();

		date_default_timezone_set('UTC');

		$retValue = False;

		$excelDateTime = floor(PHPExcel_Shared_Date::PHPToExcel(time()));

		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					$retValue = (float) $excelDateTime;

					break;

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					$retValue = (integer) PHPExcel_Shared_Date::ExcelToPHP($excelDateTime);

					break;

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					$retValue = PHPExcel_Shared_Date::ExcelToPHPObject($excelDateTime);

					break;

		}

		date_default_timezone_set($saveTimeZone);



		return $retValue;

	}	//	function DATENOW()





	/**

	 * DATE

	 *

	 * The DATE function returns a value that represents a particular date.

	 *

	 * NOTE: When used in a Cell Formula, MS Excel changes the cell format so that it matches the date

	 * format of your regional settings. PHPExcel does not change cell formatting in this way.

	 *

	 * Excel Function:

	 *		DATE(year,month,day)

	 *

	 * PHPExcel is a lot more forgiving than MS Excel when passing non numeric values to this function.

	 * A Month name or abbreviation (English only at this point) such as 'January' or 'Jan' will still be accepted,

	 *     as will a day value with a suffix (e.g. '21st' rather than simply 21); again only English language.

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	integer		$year	The value of the year argument can include one to four digits.

	 *								Excel interprets the year argument according to the configured

	 *								date system: 1900 or 1904.

	 *								If year is between 0 (zero) and 1899 (inclusive), Excel adds that

	 *								value to 1900 to calculate the year. For example, DATE(108,1,2)

	 *								returns January 2, 2008 (1900+108).

	 *								If year is between 1900 and 9999 (inclusive), Excel uses that

	 *								value as the year. For example, DATE(2008,1,2) returns January 2,

	 *								2008.

	 *								If year is less than 0 or is 10000 or greater, Excel returns the

	 *								#NUM! error value.

	 * @param	integer		$month	A positive or negative integer representing the month of the year

	 *								from 1 to 12 (January to December).

	 *								If month is greater than 12, month adds that number of months to

	 *								the first month in the year specified. For example, DATE(2008,14,2)

	 *								returns the serial number representing February 2, 2009.

	 *								If month is less than 1, month subtracts the magnitude of that

	 *								number of months, plus 1, from the first month in the year

	 *								specified. For example, DATE(2008,-3,2) returns the serial number

	 *								representing September 2, 2007.

	 * @param	integer		$day	A positive or negative integer representing the day of the month

	 *								from 1 to 31.

	 *								If day is greater than the number of days in the month specified,

	 *								day adds that number of days to the first day in the month. For

	 *								example, DATE(2008,1,35) returns the serial number representing

	 *								February 4, 2008.

	 *								If day is less than 1, day subtracts the magnitude that number of

	 *								days, plus one, from the first day of the month specified. For

	 *								example, DATE(2008,1,-15) returns the serial number representing

	 *								December 16, 2007.

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function DATE($year = 0, $month = 1, $day = 1) {

		$year	= PHPExcel_Calculation_Functions::flattenSingleValue($year);

		$month	= PHPExcel_Calculation_Functions::flattenSingleValue($month);

		$day	= PHPExcel_Calculation_Functions::flattenSingleValue($day);



		if (($month !== NULL) && (!is_numeric($month))) {

            $month = PHPExcel_Shared_Date::monthStringToNumber($month);

		}



		if (($day !== NULL) && (!is_numeric($day))) {

            $day = PHPExcel_Shared_Date::dayStringToNumber($day);

		}



		$year	= ($year !== NULL)	? PHPExcel_Shared_String::testStringAsNumeric($year) : 0;

		$month	= ($month !== NULL)	? PHPExcel_Shared_String::testStringAsNumeric($month) : 0;

		$day	= ($day !== NULL)	? PHPExcel_Shared_String::testStringAsNumeric($day) : 0;

		if ((!is_numeric($year)) ||

			(!is_numeric($month)) ||

			(!is_numeric($day))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$year	= (integer) $year;

		$month	= (integer) $month;

		$day	= (integer) $day;



		$baseYear = PHPExcel_Shared_Date::getExcelCalendar();

		// Validate parameters

		if ($year < ($baseYear-1900)) {

			return PHPExcel_Calculation_Functions::NaN();

		}

		if ((($baseYear-1900) != 0) && ($year < $baseYear) && ($year >= 1900)) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		if (($year < $baseYear) && ($year >= ($baseYear-1900))) {

			$year += 1900;

		}



		if ($month < 1) {

			//	Handle year/month adjustment if month < 1

			--$month;

			$year += ceil($month / 12) - 1;

			$month = 13 - abs($month % 12);

		} elseif ($month > 12) {

			//	Handle year/month adjustment if month > 12

			$year += floor($month / 12);

			$month = ($month % 12);

		}



		// Re-validate the year parameter after adjustments

		if (($year < $baseYear) || ($year >= 10000)) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$excelDateValue = PHPExcel_Shared_Date::FormattedPHPToExcel($year, $month, $day);

		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					return (float) $excelDateValue;

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					return (integer) PHPExcel_Shared_Date::ExcelToPHP($excelDateValue);

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					return PHPExcel_Shared_Date::ExcelToPHPObject($excelDateValue);

		}

	}	//	function DATE()





	/**

	 * TIME

	 *

	 * The TIME function returns a value that represents a particular time.

	 *

	 * NOTE: When used in a Cell Formula, MS Excel changes the cell format so that it matches the time

	 * format of your regional settings. PHPExcel does not change cell formatting in this way.

	 *

	 * Excel Function:

	 *		TIME(hour,minute,second)

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	integer		$hour		A number from 0 (zero) to 32767 representing the hour.

	 *									Any value greater than 23 will be divided by 24 and the remainder

	 *									will be treated as the hour value. For example, TIME(27,0,0) =

	 *									TIME(3,0,0) = .125 or 3:00 AM.

	 * @param	integer		$minute		A number from 0 to 32767 representing the minute.

	 *									Any value greater than 59 will be converted to hours and minutes.

	 *									For example, TIME(0,750,0) = TIME(12,30,0) = .520833 or 12:30 PM.

	 * @param	integer		$second		A number from 0 to 32767 representing the second.

	 *									Any value greater than 59 will be converted to hours, minutes,

	 *									and seconds. For example, TIME(0,0,2000) = TIME(0,33,22) = .023148

	 *									or 12:33:20 AM

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function TIME($hour = 0, $minute = 0, $second = 0) {

		$hour	= PHPExcel_Calculation_Functions::flattenSingleValue($hour);

		$minute	= PHPExcel_Calculation_Functions::flattenSingleValue($minute);

		$second	= PHPExcel_Calculation_Functions::flattenSingleValue($second);



		if ($hour == '') { $hour = 0; }

		if ($minute == '') { $minute = 0; }

		if ($second == '') { $second = 0; }



		if ((!is_numeric($hour)) || (!is_numeric($minute)) || (!is_numeric($second))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$hour	= (integer) $hour;

		$minute	= (integer) $minute;

		$second	= (integer) $second;



		if ($second < 0) {

			$minute += floor($second / 60);

			$second = 60 - abs($second % 60);

			if ($second == 60) { $second = 0; }

		} elseif ($second >= 60) {

			$minute += floor($second / 60);

			$second = $second % 60;

		}

		if ($minute < 0) {

			$hour += floor($minute / 60);

			$minute = 60 - abs($minute % 60);

			if ($minute == 60) { $minute = 0; }

		} elseif ($minute >= 60) {

			$hour += floor($minute / 60);

			$minute = $minute % 60;

		}



		if ($hour > 23) {

			$hour = $hour % 24;

		} elseif ($hour < 0) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					$date = 0;

					$calendar = PHPExcel_Shared_Date::getExcelCalendar();

					if ($calendar != PHPExcel_Shared_Date::CALENDAR_WINDOWS_1900) {

						$date = 1;

					}

					return (float) PHPExcel_Shared_Date::FormattedPHPToExcel($calendar, 1, $date, $hour, $minute, $second);

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					return (integer) PHPExcel_Shared_Date::ExcelToPHP(PHPExcel_Shared_Date::FormattedPHPToExcel(1970, 1, 1, $hour, $minute, $second));	// -2147468400; //	-2147472000 + 3600

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					$dayAdjust = 0;

					if ($hour < 0) {

						$dayAdjust = floor($hour / 24);

						$hour = 24 - abs($hour % 24);

						if ($hour == 24) { $hour = 0; }

					} elseif ($hour >= 24) {

						$dayAdjust = floor($hour / 24);

						$hour = $hour % 24;

					}

					$phpDateObject = new DateTime('1900-01-01 '.$hour.':'.$minute.':'.$second);

					if ($dayAdjust != 0) {

						$phpDateObject->modify($dayAdjust.' days');

					}

					return $phpDateObject;

		}

	}	//	function TIME()





	/**

	 * DATEVALUE

	 *

	 * Returns a value that represents a particular date.

	 * Use DATEVALUE to convert a date represented by a text string to an Excel or PHP date/time stamp

	 * value.

	 *

	 * NOTE: When used in a Cell Formula, MS Excel changes the cell format so that it matches the date

	 * format of your regional settings. PHPExcel does not change cell formatting in this way.

	 *

	 * Excel Function:

	 *		DATEVALUE(dateValue)

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	string	$dateValue		Text that represents a date in a Microsoft Excel date format.

	 *									For example, "1/30/2008" or "30-Jan-2008" are text strings within

	 *									quotation marks that represent dates. Using the default date

	 *									system in Excel for Windows, date_text must represent a date from

	 *									January 1, 1900, to December 31, 9999. Using the default date

	 *									system in Excel for the Macintosh, date_text must represent a date

	 *									from January 1, 1904, to December 31, 9999. DATEVALUE returns the

	 *									#VALUE! error value if date_text is out of this range.

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function DATEVALUE($dateValue = 1) {

		$dateValue = trim(PHPExcel_Calculation_Functions::flattenSingleValue($dateValue),'"');

		//	Strip any ordinals because they're allowed in Excel (English only)

		$dateValue = preg_replace('/(\d)(st|nd|rd|th)([ -\/])/Ui','$1$3',$dateValue);

		//	Convert separators (/ . or space) to hyphens (should also handle dot used for ordinals in some countries, e.g. Denmark, Germany)

		$dateValue	= str_replace(array('/','.','-','  '),array(' ',' ',' ',' '),$dateValue);



		$yearFound = false;

		$t1 = explode(' ',$dateValue);

		foreach($t1 as &$t) {

			if ((is_numeric($t)) && ($t > 31)) {

				if ($yearFound) {

					return PHPExcel_Calculation_Functions::VALUE();

				} else {

					if ($t < 100) { $t += 1900; }

					$yearFound = true;

				}

			}

		}

		if ((count($t1) == 1) && (strpos($t,':') != false)) {

			//	We've been fed a time value without any date

			return 0.0;

		} elseif (count($t1) == 2) {

			//	We only have two parts of the date: either day/month or month/year

			if ($yearFound) {

				array_unshift($t1,1);

			} else {

				array_push($t1,date('Y'));

			}

		}

		unset($t);

		$dateValue = implode(' ',$t1);



		$PHPDateArray = date_parse($dateValue);

		if (($PHPDateArray === False) || ($PHPDateArray['error_count'] > 0)) {

			$testVal1 = strtok($dateValue,'- ');

			if ($testVal1 !== False) {

				$testVal2 = strtok('- ');

				if ($testVal2 !== False) {

					$testVal3 = strtok('- ');

					if ($testVal3 === False) {

						$testVal3 = strftime('%Y');

					}

				} else {

					return PHPExcel_Calculation_Functions::VALUE();

				}

			} else {

				return PHPExcel_Calculation_Functions::VALUE();

			}

			$PHPDateArray = date_parse($testVal1.'-'.$testVal2.'-'.$testVal3);

			if (($PHPDateArray === False) || ($PHPDateArray['error_count'] > 0)) {

				$PHPDateArray = date_parse($testVal2.'-'.$testVal1.'-'.$testVal3);

				if (($PHPDateArray === False) || ($PHPDateArray['error_count'] > 0)) {

					return PHPExcel_Calculation_Functions::VALUE();

				}

			}

		}



		if (($PHPDateArray !== False) && ($PHPDateArray['error_count'] == 0)) {

			// Execute function

			if ($PHPDateArray['year'] == '')	{ $PHPDateArray['year'] = strftime('%Y'); }

			if ($PHPDateArray['year'] < 1900)

				return PHPExcel_Calculation_Functions::VALUE();

			if ($PHPDateArray['month'] == '')	{ $PHPDateArray['month'] = strftime('%m'); }

			if ($PHPDateArray['day'] == '')		{ $PHPDateArray['day'] = strftime('%d'); }

			$excelDateValue = floor(PHPExcel_Shared_Date::FormattedPHPToExcel($PHPDateArray['year'],$PHPDateArray['month'],$PHPDateArray['day'],$PHPDateArray['hour'],$PHPDateArray['minute'],$PHPDateArray['second']));



			switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

				case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

						return (float) $excelDateValue;

				case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

						return (integer) PHPExcel_Shared_Date::ExcelToPHP($excelDateValue);

				case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

						return new DateTime($PHPDateArray['year'].'-'.$PHPDateArray['month'].'-'.$PHPDateArray['day'].' 00:00:00');

			}

		}

		return PHPExcel_Calculation_Functions::VALUE();

	}	//	function DATEVALUE()





	/**

	 * TIMEVALUE

	 *

	 * Returns a value that represents a particular time.

	 * Use TIMEVALUE to convert a time represented by a text string to an Excel or PHP date/time stamp

	 * value.

	 *

	 * NOTE: When used in a Cell Formula, MS Excel changes the cell format so that it matches the time

	 * format of your regional settings. PHPExcel does not change cell formatting in this way.

	 *

	 * Excel Function:

	 *		TIMEVALUE(timeValue)

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	string	$timeValue		A text string that represents a time in any one of the Microsoft

	 *									Excel time formats; for example, "6:45 PM" and "18:45" text strings

	 *									within quotation marks that represent time.

	 *									Date information in time_text is ignored.

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function TIMEVALUE($timeValue) {

		$timeValue = trim(PHPExcel_Calculation_Functions::flattenSingleValue($timeValue),'"');

		$timeValue	= str_replace(array('/','.'),array('-','-'),$timeValue);



		$PHPDateArray = date_parse($timeValue);

		if (($PHPDateArray !== False) && ($PHPDateArray['error_count'] == 0)) {

			if (PHPExcel_Calculation_Functions::getCompatibilityMode() == PHPExcel_Calculation_Functions::COMPATIBILITY_OPENOFFICE) {

				$excelDateValue = PHPExcel_Shared_Date::FormattedPHPToExcel($PHPDateArray['year'],$PHPDateArray['month'],$PHPDateArray['day'],$PHPDateArray['hour'],$PHPDateArray['minute'],$PHPDateArray['second']);

			} else {

				$excelDateValue = PHPExcel_Shared_Date::FormattedPHPToExcel(1900,1,1,$PHPDateArray['hour'],$PHPDateArray['minute'],$PHPDateArray['second']) - 1;

			}



			switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

				case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

						return (float) $excelDateValue;

				case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

						return (integer) $phpDateValue = PHPExcel_Shared_Date::ExcelToPHP($excelDateValue+25569) - 3600;;

				case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

						return new DateTime('1900-01-01 '.$PHPDateArray['hour'].':'.$PHPDateArray['minute'].':'.$PHPDateArray['second']);

			}

		}

		return PHPExcel_Calculation_Functions::VALUE();

	}	//	function TIMEVALUE()





	/**

	 * DATEDIF

	 *

	 * @param	mixed	$startDate		Excel date serial value, PHP date/time stamp, PHP DateTime object

	 *									or a standard date string

	 * @param	mixed	$endDate		Excel date serial value, PHP date/time stamp, PHP DateTime object

	 *									or a standard date string

	 * @param	string	$unit

	 * @return	integer	Interval between the dates

	 */

	public static function DATEDIF($startDate = 0, $endDate = 0, $unit = 'D') {

		$startDate	= PHPExcel_Calculation_Functions::flattenSingleValue($startDate);

		$endDate	= PHPExcel_Calculation_Functions::flattenSingleValue($endDate);

		$unit		= strtoupper(PHPExcel_Calculation_Functions::flattenSingleValue($unit));



		if (is_string($startDate = self::_getDateValue($startDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		if (is_string($endDate = self::_getDateValue($endDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}



		// Validate parameters

		if ($startDate >= $endDate) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$difference = $endDate - $startDate;



		$PHPStartDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($startDate);

		$startDays = $PHPStartDateObject->format('j');

		$startMonths = $PHPStartDateObject->format('n');

		$startYears = $PHPStartDateObject->format('Y');



		$PHPEndDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($endDate);

		$endDays = $PHPEndDateObject->format('j');

		$endMonths = $PHPEndDateObject->format('n');

		$endYears = $PHPEndDateObject->format('Y');



		$retVal = PHPExcel_Calculation_Functions::NaN();

		switch ($unit) {

			case 'D':

				$retVal = intval($difference);

				break;

			case 'M':

				$retVal = intval($endMonths - $startMonths) + (intval($endYears - $startYears) * 12);

				//	We're only interested in full months

				if ($endDays < $startDays) {

					--$retVal;

				}

				break;

			case 'Y':

				$retVal = intval($endYears - $startYears);

				//	We're only interested in full months

				if ($endMonths < $startMonths) {

					--$retVal;

				} elseif (($endMonths == $startMonths) && ($endDays < $startDays)) {

					--$retVal;

				}

				break;

			case 'MD':

				if ($endDays < $startDays) {

					$retVal = $endDays;

					$PHPEndDateObject->modify('-'.$endDays.' days');

					$adjustDays = $PHPEndDateObject->format('j');

					if ($adjustDays > $startDays) {

						$retVal += ($adjustDays - $startDays);

					}

				} else {

					$retVal = $endDays - $startDays;

				}

				break;

			case 'YM':

				$retVal = intval($endMonths - $startMonths);

				if ($retVal < 0) $retVal = 12 + $retVal;

				//	We're only interested in full months

				if ($endDays < $startDays) {

					--$retVal;

				}

				break;

			case 'YD':

				$retVal = intval($difference);

				if ($endYears > $startYears) {

					while ($endYears > $startYears) {

						$PHPEndDateObject->modify('-1 year');

						$endYears = $PHPEndDateObject->format('Y');

					}

					$retVal = $PHPEndDateObject->format('z') - $PHPStartDateObject->format('z');

					if ($retVal < 0) { $retVal += 365; }

				}

				break;

			default:

				$retVal = PHPExcel_Calculation_Functions::NaN();

		}

		return $retVal;

	}	//	function DATEDIF()





	/**

	 * DAYS360

	 *

	 * Returns the number of days between two dates based on a 360-day year (twelve 30-day months),

	 * which is used in some accounting calculations. Use this function to help compute payments if

	 * your accounting system is based on twelve 30-day months.

	 *

	 * Excel Function:

	 *		DAYS360(startDate,endDate[,method])

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	mixed		$startDate		Excel date serial value (float), PHP date timestamp (integer),

	 *										PHP DateTime object, or a standard date string

	 * @param	mixed		$endDate		Excel date serial value (float), PHP date timestamp (integer),

	 *										PHP DateTime object, or a standard date string

	 * @param	boolean		$method			US or European Method

	 *										FALSE or omitted: U.S. (NASD) method. If the starting date is

	 *										the last day of a month, it becomes equal to the 30th of the

	 *										same month. If the ending date is the last day of a month and

	 *										the starting date is earlier than the 30th of a month, the

	 *										ending date becomes equal to the 1st of the next month;

	 *										otherwise the ending date becomes equal to the 30th of the

	 *										same month.

	 *										TRUE: European method. Starting dates and ending dates that

	 *										occur on the 31st of a month become equal to the 30th of the

	 *										same month.

	 * @return	integer		Number of days between start date and end date

	 */

	public static function DAYS360($startDate = 0, $endDate = 0, $method = false) {

		$startDate	= PHPExcel_Calculation_Functions::flattenSingleValue($startDate);

		$endDate	= PHPExcel_Calculation_Functions::flattenSingleValue($endDate);



		if (is_string($startDate = self::_getDateValue($startDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		if (is_string($endDate = self::_getDateValue($endDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}



		if (!is_bool($method)) {

			return PHPExcel_Calculation_Functions::VALUE();

		}



		// Execute function

		$PHPStartDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($startDate);

		$startDay = $PHPStartDateObject->format('j');

		$startMonth = $PHPStartDateObject->format('n');

		$startYear = $PHPStartDateObject->format('Y');



		$PHPEndDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($endDate);

		$endDay = $PHPEndDateObject->format('j');

		$endMonth = $PHPEndDateObject->format('n');

		$endYear = $PHPEndDateObject->format('Y');



		return self::_dateDiff360($startDay, $startMonth, $startYear, $endDay, $endMonth, $endYear, !$method);

	}	//	function DAYS360()





	/**

	 * YEARFRAC

	 *

	 * Calculates the fraction of the year represented by the number of whole days between two dates

	 * (the start_date and the end_date).

	 * Use the YEARFRAC worksheet function to identify the proportion of a whole year's benefits or

	 * obligations to assign to a specific term.

	 *

	 * Excel Function:

	 *		YEARFRAC(startDate,endDate[,method])

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	mixed	$startDate		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @param	mixed	$endDate		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @param	integer	$method			Method used for the calculation

	 *										0 or omitted	US (NASD) 30/360

	 *										1				Actual/actual

	 *										2				Actual/360

	 *										3				Actual/365

	 *										4				European 30/360

	 * @return	float	fraction of the year

	 */

	public static function YEARFRAC($startDate = 0, $endDate = 0, $method = 0) {

		$startDate	= PHPExcel_Calculation_Functions::flattenSingleValue($startDate);

		$endDate	= PHPExcel_Calculation_Functions::flattenSingleValue($endDate);

		$method		= PHPExcel_Calculation_Functions::flattenSingleValue($method);



		if (is_string($startDate = self::_getDateValue($startDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		if (is_string($endDate = self::_getDateValue($endDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}



		if (((is_numeric($method)) && (!is_string($method))) || ($method == '')) {

			switch($method) {

				case 0	:

					return self::DAYS360($startDate,$endDate) / 360;

				case 1	:

					$days = self::DATEDIF($startDate,$endDate);

					$startYear = self::YEAR($startDate);

					$endYear = self::YEAR($endDate);

					$years = $endYear - $startYear + 1;

					$leapDays = 0;

					if ($years == 1) {

						if (self::_isLeapYear($endYear)) {

							$startMonth = self::MONTHOFYEAR($startDate);

							$endMonth = self::MONTHOFYEAR($endDate);

							$endDay = self::DAYOFMONTH($endDate);

							if (($startMonth < 3) ||

								(($endMonth * 100 + $endDay) >= (2 * 100 + 29))) {

				     			$leapDays += 1;

							}

						}

					} else {

						for($year = $startYear; $year <= $endYear; ++$year) {

							if ($year == $startYear) {

								$startMonth = self::MONTHOFYEAR($startDate);

								$startDay = self::DAYOFMONTH($startDate);

								if ($startMonth < 3) {

									$leapDays += (self::_isLeapYear($year)) ? 1 : 0;

								}

							} elseif($year == $endYear) {

								$endMonth = self::MONTHOFYEAR($endDate);

								$endDay = self::DAYOFMONTH($endDate);

								if (($endMonth * 100 + $endDay) >= (2 * 100 + 29)) {

									$leapDays += (self::_isLeapYear($year)) ? 1 : 0;

								}

							} else {

								$leapDays += (self::_isLeapYear($year)) ? 1 : 0;

							}

						}

						if ($years == 2) {

							if (($leapDays == 0) && (self::_isLeapYear($startYear)) && ($days > 365)) {

								$leapDays = 1;

							} elseif ($days < 366) {

								$years = 1;

							}

						}

						$leapDays /= $years;

					}

					return $days / (365 + $leapDays);

				case 2	:

					return self::DATEDIF($startDate,$endDate) / 360;

				case 3	:

					return self::DATEDIF($startDate,$endDate) / 365;

				case 4	:

					return self::DAYS360($startDate,$endDate,True) / 360;

			}

		}

		return PHPExcel_Calculation_Functions::VALUE();

	}	//	function YEARFRAC()





	/**

	 * NETWORKDAYS

	 *

	 * Returns the number of whole working days between start_date and end_date. Working days

	 * exclude weekends and any dates identified in holidays.

	 * Use NETWORKDAYS to calculate employee benefits that accrue based on the number of days

	 * worked during a specific term.

	 *

	 * Excel Function:

	 *		NETWORKDAYS(startDate,endDate[,holidays[,holiday[,...]]])

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	mixed			$startDate		Excel date serial value (float), PHP date timestamp (integer),

	 *											PHP DateTime object, or a standard date string

	 * @param	mixed			$endDate		Excel date serial value (float), PHP date timestamp (integer),

	 *											PHP DateTime object, or a standard date string

	 * @param	mixed			$holidays,...	Optional series of Excel date serial value (float), PHP date

	 *											timestamp (integer), PHP DateTime object, or a standard date

	 *											strings that will be excluded from the working calendar, such

	 *											as state and federal holidays and floating holidays.

	 * @return	integer			Interval between the dates

	 */

	public static function NETWORKDAYS($startDate,$endDate) {

		//	Retrieve the mandatory start and end date that are referenced in the function definition

		$startDate	= PHPExcel_Calculation_Functions::flattenSingleValue($startDate);

		$endDate	= PHPExcel_Calculation_Functions::flattenSingleValue($endDate);

		//	Flush the mandatory start and end date that are referenced in the function definition, and get the optional days

		$dateArgs = PHPExcel_Calculation_Functions::flattenArray(func_get_args());

		array_shift($dateArgs);

		array_shift($dateArgs);



		//	Validate the start and end dates

		if (is_string($startDate = $sDate = self::_getDateValue($startDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$startDate = (float) floor($startDate);

		if (is_string($endDate = $eDate = self::_getDateValue($endDate))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$endDate = (float) floor($endDate);



		if ($sDate > $eDate) {

			$startDate = $eDate;

			$endDate = $sDate;

		}



		// Execute function

		$startDoW = 6 - self::DAYOFWEEK($startDate,2);

		if ($startDoW < 0) { $startDoW = 0; }

		$endDoW = self::DAYOFWEEK($endDate,2);

		if ($endDoW >= 6) { $endDoW = 0; }



		$wholeWeekDays = floor(($endDate - $startDate) / 7) * 5;

		$partWeekDays = $endDoW + $startDoW;

		if ($partWeekDays > 5) {

			$partWeekDays -= 5;

		}



		//	Test any extra holiday parameters

		$holidayCountedArray = array();

		foreach ($dateArgs as $holidayDate) {

			if (is_string($holidayDate = self::_getDateValue($holidayDate))) {

				return PHPExcel_Calculation_Functions::VALUE();

			}

			if (($holidayDate >= $startDate) && ($holidayDate <= $endDate)) {

				if ((self::DAYOFWEEK($holidayDate,2) < 6) && (!in_array($holidayDate,$holidayCountedArray))) {

					--$partWeekDays;

					$holidayCountedArray[] = $holidayDate;

				}

			}

		}



		if ($sDate > $eDate) {

			return 0 - ($wholeWeekDays + $partWeekDays);

		}

		return $wholeWeekDays + $partWeekDays;

	}	//	function NETWORKDAYS()





	/**

	 * WORKDAY

	 *

	 * Returns the date that is the indicated number of working days before or after a date (the

	 * starting date). Working days exclude weekends and any dates identified as holidays.

	 * Use WORKDAY to exclude weekends or holidays when you calculate invoice due dates, expected

	 * delivery times, or the number of days of work performed.

	 *

	 * Excel Function:

	 *		WORKDAY(startDate,endDays[,holidays[,holiday[,...]]])

	 *

	 * @access	public

	 * @category Date/Time Functions

	 * @param	mixed		$startDate		Excel date serial value (float), PHP date timestamp (integer),

	 *										PHP DateTime object, or a standard date string

	 * @param	integer		$endDays		The number of nonweekend and nonholiday days before or after

	 *										startDate. A positive value for days yields a future date; a

	 *										negative value yields a past date.

	 * @param	mixed		$holidays,...	Optional series of Excel date serial value (float), PHP date

	 *										timestamp (integer), PHP DateTime object, or a standard date

	 *										strings that will be excluded from the working calendar, such

	 *										as state and federal holidays and floating holidays.

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function WORKDAY($startDate,$endDays) {

		//	Retrieve the mandatory start date and days that are referenced in the function definition

		$startDate	= PHPExcel_Calculation_Functions::flattenSingleValue($startDate);

		$endDays	= PHPExcel_Calculation_Functions::flattenSingleValue($endDays);

		//	Flush the mandatory start date and days that are referenced in the function definition, and get the optional days

		$dateArgs = PHPExcel_Calculation_Functions::flattenArray(func_get_args());

		array_shift($dateArgs);

		array_shift($dateArgs);



		if ((is_string($startDate = self::_getDateValue($startDate))) || (!is_numeric($endDays))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$startDate = (float) floor($startDate);

		$endDays = (int) floor($endDays);

		//	If endDays is 0, we always return startDate

		if ($endDays == 0) { return $startDate; }



		$decrementing = ($endDays < 0) ? True : False;



		//	Adjust the start date if it falls over a weekend



		$startDoW = self::DAYOFWEEK($startDate,3);

		if (self::DAYOFWEEK($startDate,3) >= 5) {

			$startDate += ($decrementing) ? -$startDoW + 4: 7 - $startDoW;

			($decrementing) ? $endDays++ : $endDays--;

		}



		//	Add endDays

		$endDate = (float) $startDate + (intval($endDays / 5) * 7) + ($endDays % 5);



		//	Adjust the calculated end date if it falls over a weekend

		$endDoW = self::DAYOFWEEK($endDate,3);

		if ($endDoW >= 5) {

			$endDate += ($decrementing) ? -$endDoW + 4: 7 - $endDoW;

		}



		//	Test any extra holiday parameters

		if (!empty($dateArgs)) {

			$holidayCountedArray = $holidayDates = array();

			foreach ($dateArgs as $holidayDate) {

				if (($holidayDate !== NULL) && (trim($holidayDate) > '')) {

					if (is_string($holidayDate = self::_getDateValue($holidayDate))) {

						return PHPExcel_Calculation_Functions::VALUE();

					}

					if (self::DAYOFWEEK($holidayDate,3) < 5) {

						$holidayDates[] = $holidayDate;

					}

				}

			}

			if ($decrementing) {

				rsort($holidayDates, SORT_NUMERIC);

			} else {

				sort($holidayDates, SORT_NUMERIC);

			}

			foreach ($holidayDates as $holidayDate) {

				if ($decrementing) {

					if (($holidayDate <= $startDate) && ($holidayDate >= $endDate)) {

						if (!in_array($holidayDate,$holidayCountedArray)) {

							--$endDate;

							$holidayCountedArray[] = $holidayDate;

						}

					}

				} else {

					if (($holidayDate >= $startDate) && ($holidayDate <= $endDate)) {

						if (!in_array($holidayDate,$holidayCountedArray)) {

							++$endDate;

							$holidayCountedArray[] = $holidayDate;

						}

					}

				}

				//	Adjust the calculated end date if it falls over a weekend

				$endDoW = self::DAYOFWEEK($endDate,3);

				if ($endDoW >= 5) {

					$endDate += ($decrementing) ? -$endDoW + 4: 7 - $endDoW;

				}



			}

		}



		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					return (float) $endDate;

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					return (integer) PHPExcel_Shared_Date::ExcelToPHP($endDate);

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					return PHPExcel_Shared_Date::ExcelToPHPObject($endDate);

		}

	}	//	function WORKDAY()





	/**

	 * DAYOFMONTH

	 *

	 * Returns the day of the month, for a specified date. The day is given as an integer

	 * ranging from 1 to 31.

	 *

	 * Excel Function:

	 *		DAY(dateValue)

	 *

	 * @param	mixed	$dateValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @return	int		Day of the month

	 */

	public static function DAYOFMONTH($dateValue = 1) {

		$dateValue	= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif ($dateValue == 0.0) {

			return 0;

		} elseif ($dateValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$PHPDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($dateValue);



		return (int) $PHPDateObject->format('j');

	}	//	function DAYOFMONTH()





	/**

	 * DAYOFWEEK

	 *

	 * Returns the day of the week for a specified date. The day is given as an integer

	 * ranging from 0 to 7 (dependent on the requested style).

	 *

	 * Excel Function:

	 *		WEEKDAY(dateValue[,style])

	 *

	 * @param	mixed	$dateValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @param	int		$style			A number that determines the type of return value

	 *										1 or omitted	Numbers 1 (Sunday) through 7 (Saturday).

	 *										2				Numbers 1 (Monday) through 7 (Sunday).

	 *										3				Numbers 0 (Monday) through 6 (Sunday).

	 * @return	int		Day of the week value

	 */

	public static function DAYOFWEEK($dateValue = 1, $style = 1) {

		$dateValue	= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);

		$style		= PHPExcel_Calculation_Functions::flattenSingleValue($style);



		if (!is_numeric($style)) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif (($style < 1) || ($style > 3)) {

			return PHPExcel_Calculation_Functions::NaN();

		}

		$style = floor($style);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif ($dateValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$PHPDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($dateValue);

		$DoW = $PHPDateObject->format('w');



		$firstDay = 1;

		switch ($style) {

			case 1: ++$DoW;

					break;

			case 2: if ($DoW == 0) { $DoW = 7; }

					break;

			case 3: if ($DoW == 0) { $DoW = 7; }

					$firstDay = 0;

					--$DoW;

					break;

		}

		if (PHPExcel_Calculation_Functions::getCompatibilityMode() == PHPExcel_Calculation_Functions::COMPATIBILITY_EXCEL) {

			//	Test for Excel's 1900 leap year, and introduce the error as required

			if (($PHPDateObject->format('Y') == 1900) && ($PHPDateObject->format('n') <= 2)) {

				--$DoW;

				if ($DoW < $firstDay) {

					$DoW += 7;

				}

			}

		}



		return (int) $DoW;

	}	//	function DAYOFWEEK()





	/**

	 * WEEKOFYEAR

	 *

	 * Returns the week of the year for a specified date.

	 * The WEEKNUM function considers the week containing January 1 to be the first week of the year.

	 * However, there is a European standard that defines the first week as the one with the majority

	 * of days (four or more) falling in the new year. This means that for years in which there are

	 * three days or less in the first week of January, the WEEKNUM function returns week numbers

	 * that are incorrect according to the European standard.

	 *

	 * Excel Function:

	 *		WEEKNUM(dateValue[,style])

	 *

	 * @param	mixed	$dateValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @param	boolean	$method			Week begins on Sunday or Monday

	 *										1 or omitted	Week begins on Sunday.

	 *										2				Week begins on Monday.

	 * @return	int		Week Number

	 */

	public static function WEEKOFYEAR($dateValue = 1, $method = 1) {

		$dateValue	= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);

		$method		= PHPExcel_Calculation_Functions::flattenSingleValue($method);



		if (!is_numeric($method)) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif (($method < 1) || ($method > 2)) {

			return PHPExcel_Calculation_Functions::NaN();

		}

		$method = floor($method);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif ($dateValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$PHPDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($dateValue);

		$dayOfYear = $PHPDateObject->format('z');

		$dow = $PHPDateObject->format('w');

		$PHPDateObject->modify('-'.$dayOfYear.' days');

		$dow = $PHPDateObject->format('w');

		$daysInFirstWeek = 7 - (($dow + (2 - $method)) % 7);

		$dayOfYear -= $daysInFirstWeek;

		$weekOfYear = ceil($dayOfYear / 7) + 1;



		return (int) $weekOfYear;

	}	//	function WEEKOFYEAR()





	/**

	 * MONTHOFYEAR

	 *

	 * Returns the month of a date represented by a serial number.

	 * The month is given as an integer, ranging from 1 (January) to 12 (December).

	 *

	 * Excel Function:

	 *		MONTH(dateValue)

	 *

	 * @param	mixed	$dateValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @return	int		Month of the year

	 */

	public static function MONTHOFYEAR($dateValue = 1) {

		$dateValue	= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif ($dateValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$PHPDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($dateValue);



		return (int) $PHPDateObject->format('n');

	}	//	function MONTHOFYEAR()





	/**

	 * YEAR

	 *

	 * Returns the year corresponding to a date.

	 * The year is returned as an integer in the range 1900-9999.

	 *

	 * Excel Function:

	 *		YEAR(dateValue)

	 *

	 * @param	mixed	$dateValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard date string

	 * @return	int		Year

	 */

	public static function YEAR($dateValue = 1) {

		$dateValue	= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		} elseif ($dateValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		// Execute function

		$PHPDateObject = PHPExcel_Shared_Date::ExcelToPHPObject($dateValue);



		return (int) $PHPDateObject->format('Y');

	}	//	function YEAR()





	/**

	 * HOUROFDAY

	 *

	 * Returns the hour of a time value.

	 * The hour is given as an integer, ranging from 0 (12:00 A.M.) to 23 (11:00 P.M.).

	 *

	 * Excel Function:

	 *		HOUR(timeValue)

	 *

	 * @param	mixed	$timeValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard time string

	 * @return	int		Hour

	 */

	public static function HOUROFDAY($timeValue = 0) {

		$timeValue	= PHPExcel_Calculation_Functions::flattenSingleValue($timeValue);



		if (!is_numeric($timeValue)) {

			if (PHPExcel_Calculation_Functions::getCompatibilityMode() == PHPExcel_Calculation_Functions::COMPATIBILITY_GNUMERIC) {

				$testVal = strtok($timeValue,'/-: ');

				if (strlen($testVal) < strlen($timeValue)) {

					return PHPExcel_Calculation_Functions::VALUE();

				}

			}

			$timeValue = self::_getTimeValue($timeValue);

			if (is_string($timeValue)) {

				return PHPExcel_Calculation_Functions::VALUE();

			}

		}

		// Execute function

		if ($timeValue >= 1) {

			$timeValue = fmod($timeValue,1);

		} elseif ($timeValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}

		$timeValue = PHPExcel_Shared_Date::ExcelToPHP($timeValue);



		return (int) gmdate('G',$timeValue);

	}	//	function HOUROFDAY()





	/**

	 * MINUTEOFHOUR

	 *

	 * Returns the minutes of a time value.

	 * The minute is given as an integer, ranging from 0 to 59.

	 *

	 * Excel Function:

	 *		MINUTE(timeValue)

	 *

	 * @param	mixed	$timeValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard time string

	 * @return	int		Minute

	 */

	public static function MINUTEOFHOUR($timeValue = 0) {

		$timeValue = $timeTester	= PHPExcel_Calculation_Functions::flattenSingleValue($timeValue);



		if (!is_numeric($timeValue)) {

			if (PHPExcel_Calculation_Functions::getCompatibilityMode() == PHPExcel_Calculation_Functions::COMPATIBILITY_GNUMERIC) {

				$testVal = strtok($timeValue,'/-: ');

				if (strlen($testVal) < strlen($timeValue)) {

					return PHPExcel_Calculation_Functions::VALUE();

				}

			}

			$timeValue = self::_getTimeValue($timeValue);

			if (is_string($timeValue)) {

				return PHPExcel_Calculation_Functions::VALUE();

			}

		}

		// Execute function

		if ($timeValue >= 1) {

			$timeValue = fmod($timeValue,1);

		} elseif ($timeValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}

		$timeValue = PHPExcel_Shared_Date::ExcelToPHP($timeValue);



		return (int) gmdate('i',$timeValue);

	}	//	function MINUTEOFHOUR()





	/**

	 * SECONDOFMINUTE

	 *

	 * Returns the seconds of a time value.

	 * The second is given as an integer in the range 0 (zero) to 59.

	 *

	 * Excel Function:

	 *		SECOND(timeValue)

	 *

	 * @param	mixed	$timeValue		Excel date serial value (float), PHP date timestamp (integer),

	 *									PHP DateTime object, or a standard time string

	 * @return	int		Second

	 */

	public static function SECONDOFMINUTE($timeValue = 0) {

		$timeValue	= PHPExcel_Calculation_Functions::flattenSingleValue($timeValue);



		if (!is_numeric($timeValue)) {

			if (PHPExcel_Calculation_Functions::getCompatibilityMode() == PHPExcel_Calculation_Functions::COMPATIBILITY_GNUMERIC) {

				$testVal = strtok($timeValue,'/-: ');

				if (strlen($testVal) < strlen($timeValue)) {

					return PHPExcel_Calculation_Functions::VALUE();

				}

			}

			$timeValue = self::_getTimeValue($timeValue);

			if (is_string($timeValue)) {

				return PHPExcel_Calculation_Functions::VALUE();

			}

		}

		// Execute function

		if ($timeValue >= 1) {

			$timeValue = fmod($timeValue,1);

		} elseif ($timeValue < 0.0) {

			return PHPExcel_Calculation_Functions::NaN();

		}

		$timeValue = PHPExcel_Shared_Date::ExcelToPHP($timeValue);



		return (int) gmdate('s',$timeValue);

	}	//	function SECONDOFMINUTE()





	/**

	 * EDATE

	 *

	 * Returns the serial number that represents the date that is the indicated number of months

	 * before or after a specified date (the start_date).

	 * Use EDATE to calculate maturity dates or due dates that fall on the same day of the month

	 * as the date of issue.

	 *

	 * Excel Function:

	 *		EDATE(dateValue,adjustmentMonths)

	 *

	 * @param	mixed	$dateValue			Excel date serial value (float), PHP date timestamp (integer),

	 *										PHP DateTime object, or a standard date string

	 * @param	int		$adjustmentMonths	The number of months before or after start_date.

	 *										A positive value for months yields a future date;

	 *										a negative value yields a past date.

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function EDATE($dateValue = 1, $adjustmentMonths = 0) {

		$dateValue			= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);

		$adjustmentMonths	= PHPExcel_Calculation_Functions::flattenSingleValue($adjustmentMonths);



		if (!is_numeric($adjustmentMonths)) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$adjustmentMonths = floor($adjustmentMonths);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}



		// Execute function

		$PHPDateObject = self::_adjustDateByMonths($dateValue,$adjustmentMonths);



		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					return (float) PHPExcel_Shared_Date::PHPToExcel($PHPDateObject);

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					return (integer) PHPExcel_Shared_Date::ExcelToPHP(PHPExcel_Shared_Date::PHPToExcel($PHPDateObject));

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					return $PHPDateObject;

		}

	}	//	function EDATE()





	/**

	 * EOMONTH

	 *

	 * Returns the date value for the last day of the month that is the indicated number of months

	 * before or after start_date.

	 * Use EOMONTH to calculate maturity dates or due dates that fall on the last day of the month.

	 *

	 * Excel Function:

	 *		EOMONTH(dateValue,adjustmentMonths)

	 *

	 * @param	mixed	$dateValue			Excel date serial value (float), PHP date timestamp (integer),

	 *										PHP DateTime object, or a standard date string

	 * @param	int		$adjustmentMonths	The number of months before or after start_date.

	 *										A positive value for months yields a future date;

	 *										a negative value yields a past date.

	 * @return	mixed	Excel date/time serial value, PHP date/time serial value or PHP date/time object,

	 *						depending on the value of the ReturnDateType flag

	 */

	public static function EOMONTH($dateValue = 1, $adjustmentMonths = 0) {

		$dateValue			= PHPExcel_Calculation_Functions::flattenSingleValue($dateValue);

		$adjustmentMonths	= PHPExcel_Calculation_Functions::flattenSingleValue($adjustmentMonths);



		if (!is_numeric($adjustmentMonths)) {

			return PHPExcel_Calculation_Functions::VALUE();

		}

		$adjustmentMonths = floor($adjustmentMonths);



		if (is_string($dateValue = self::_getDateValue($dateValue))) {

			return PHPExcel_Calculation_Functions::VALUE();

		}



		// Execute function

		$PHPDateObject = self::_adjustDateByMonths($dateValue,$adjustmentMonths+1);

		$adjustDays = (int) $PHPDateObject->format('d');

		$adjustDaysString = '-'.$adjustDays.' days';

		$PHPDateObject->modify($adjustDaysString);



		switch (PHPExcel_Calculation_Functions::getReturnDateType()) {

			case PHPExcel_Calculation_Functions::RETURNDATE_EXCEL :

					return (float) PHPExcel_Shared_Date::PHPToExcel($PHPDateObject);

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC :

					return (integer) PHPExcel_Shared_Date::ExcelToPHP(PHPExcel_Shared_Date::PHPToExcel($PHPDateObject));

			case PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT :

					return $PHPDateObject;

		}

	}	//	function EOMONTH()



}	//	class PHPExcel_Calculation_DateTime



