File Source for Date.php

<?php
/**
* PHPExcel
*
* Copyright (c) 2006 - 2009 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 - 2009 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version 1.6.5, 2009-01-05
*/
/** PHPExcel_Cell */
require_once 'PHPExcel/Cell.php';
/** PHPExcel_Style_NumberFormat */
require_once 'PHPExcel/Style/NumberFormat.php';
/**
* PHPExcel_Shared_Date
*
* @category PHPExcel
* @package PHPExcel_Shared
* @copyright Copyright (c) 2006 - 2009 PHPExcel (http://www.codeplex.com/PHPExcel)
*/
class PHPExcel_Shared_Date
{
/** constants */
const CALENDAR_WINDOWS_1900 = 1900; // Base date of 1st Jan 1900 = 1.0
const CALENDAR_MAC_1904 = 1904; // Base date of 2nd Jan 1904 = 1.0
private static $ExcelBaseDate = self::CALENDAR_WINDOWS_1900;
public static $dateTimeObjectType = 'DateTime';
/**
* Set the Excel calendar (Windows 1900 or Mac 1904)
*
* @param integer $baseDate Excel base date
* @return boolean Success or failure
*/
public static function setExcelCalendar($baseDate) {
if (($baseDate == self::CALENDAR_WINDOWS_1900) ||
($baseDate == self::CALENDAR_MAC_1904)) {
self::$ExcelBaseDate = $baseDate;
return True;
}
return False;
} // function setExcelCalendar()
/**
* Return the Excel calendar (Windows 1900 or Mac 1904)
*
* @return integer $baseDate Excel base date
*/
public static function getExcelCalendar() {
return self::$ExcelBaseDate;
} // function getExcelCalendar()
/**
* Convert a date from Excel to PHP
*
* @param long $dateValue Excel date/time value
* @return long PHP serialized date/time
*/
public static function ExcelToPHP($dateValue = 0) {
if (self::$ExcelBaseDate == self::CALENDAR_WINDOWS_1900) {
$myExcelBaseDate = 25569;
// Adjust for the spurious 29-Feb-1900 (Day 60)
if ($dateValue < 60) {
--$myExcelBaseDate;
}
} else {
$myExcelBaseDate = 24107;
}
// Perform conversion
if ($dateValue >= 1) {
$utcDays = $dateValue - $myExcelBaseDate;
$returnValue = (integer) round($utcDays * 24 * 60 * 60);
} else {
$hours = round($dateValue * 24);
$mins = round($dateValue * 24 * 60) - round($hours * 60);
$secs = round($dateValue * 24 * 60 * 60) - round($hours * 60 * 60) - round($mins * 60);
$returnValue = (integer) mktime($hours, $mins, $secs);
}
// Return
return $returnValue;
} // function ExcelToPHP()
/**
* Convert a date from Excel to a PHP Date/Time object
*
* @param long $dateValue Excel date/time value
* @return long PHP date/time object
*/
public static function ExcelToPHPObject($dateValue = 0) {
$dateTime = self::ExcelToPHP($dateValue);
$days = floor($dateTime / 86400);
$time = round((($dateTime / 86400) - $days) * 86400);
$hours = round($time / 3600);
$minutes = round($time / 60) - ($hours * 60);
$seconds = round($time) - ($hours * 3600) - ($minutes * 60);
$dateObj = date_create('1-Jan-1970+'.$days.' days');
$dateObj->setTime($hours,$minutes,$seconds);
return $dateObj;
} // function ExcelToPHPObject()
/**
* Convert a date from PHP to Excel
*
* @param mixed $dateValue PHP serialized date/time or date object
* @return mixed Excel date/time value
* or boolean False on failure
*/
public static function PHPToExcel($dateValue = 0) {
$saveTimeZone = date_default_timezone_get();
date_default_timezone_set('UTC');
$retValue = False;
if ((is_object($dateValue)) && ($dateValue instanceof self::$dateTimeObjectType)) {
$retValue = self::FormattedPHPToExcel( $dateValue->format('Y'), $dateValue->format('m'), $dateValue->format('d'),
$dateValue->format('H'), $dateValue->format('i'), $dateValue->format('s')
);
} elseif (is_numeric($dateValue)) {
$retValue = self::FormattedPHPToExcel( date('Y',$dateValue), date('m',$dateValue), date('d',$dateValue),
date('H',$dateValue), date('i',$dateValue), date('s',$dateValue)
);
}
date_default_timezone_set($saveTimeZone);
return $retValue;
} // function PHPToExcel()
/**
* FormattedPHPToExcel
*
* @param long $year
* @param long $month
* @param long $day
* @param long $hours
* @param long $minutes
* @param long $seconds
* @return long Excel date/time value
*/
public static function FormattedPHPToExcel($year, $month, $day, $hours=0, $minutes=0, $seconds=0) {
if (self::$ExcelBaseDate == self::CALENDAR_WINDOWS_1900) {
//
// Fudge factor for the erroneous fact that the year 1900 is treated as a Leap Year in MS Excel
// This affects every date following 28th February 1900
//
$excel1900isLeapYear = True;
if (($year == 1900) && ($month <= 2)) { $excel1900isLeapYear = False; }
$myExcelBaseDate = 2415020;
} else {
$myExcelBaseDate = 2416481;
$excel1900isLeapYear = False;
}
// Julian base date Adjustment
if ($month > 2) {
$month = $month - 3;
} else {
$month = $month + 9;
--$year;
}
// Calculate the Julian Date, then subtract the Excel base date (JD 2415020 = 31-Dec-1899 Giving Excel Date of 0)
$century = substr($year,0,2);
$decade = substr($year,2,2);
$excelDate = floor((146097 * $century) / 4) + floor((1461 * $decade) / 4) + floor((153 * $month + 2) / 5) + $day + 1721119 - $myExcelBaseDate + $excel1900isLeapYear;
$excelTime = (($hours * 3600) + ($minutes * 60) + $seconds) / 86400;
return (float) $excelDate + $excelTime;
} // function FormattedPHPToExcel()
/**
* Is a given cell a date/time?
*
* @param PHPExcel_Cell $pCell
* @return boolean
*/
public static function isDateTime(PHPExcel_Cell $pCell) {
return self::isDateTimeFormat($pCell->getParent()->getStyle($pCell->getCoordinate())->getNumberFormat());
} // function isDateTime()
/**
* Is a given number format a date/time?
*
* @param PHPExcel_Style_NumberFormat $pFormat
* @return boolean
*/
public static function isDateTimeFormat(PHPExcel_Style_NumberFormat $pFormat) {
return self::isDateTimeFormatCode($pFormat->getFormatCode());
} // function isDateTimeFormat()
private static $possibleCharacters = array('y', 'm', 'd', 'H', 'i', 's');
/**
* Is a given number format code a date/time?
*
* @param string $pFormatCode
* @return boolean
*/
public static function isDateTimeFormatCode($pFormatCode = '') {
// Switch on formatcode
switch ($pFormatCode) {
case PHPExcel_Style_NumberFormat::FORMAT_DATE_YYYYMMDD:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_DDMMYYYY:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_DMYSLASH:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_DMYMINUS:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_DMMINUS:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_MYMINUS:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_DATETIME:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME1:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME2:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME3:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME4:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME5:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME6:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME7:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_TIME8:
case PHPExcel_Style_NumberFormat::FORMAT_DATE_YYYYMMDDSLASH:
return true;
}
// Try checking all possible characters
foreach (self::$possibleCharacters as $possibleCharacter) {
if ((stripos($pFormatCode,$possibleCharacter) !== false) && (strpos($pFormatCode, '[') === false) && (strpos($pFormatCode, ']') === false)) {
return true;
}
}
// No date...
return false;
} // function isDateTimeFormatCode()
}

Source for file Date.php