ThinkPHP/Library/Org/Util/PHPExcel/Calculation/DateTime.php

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<?php

/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
    /**
     * @ignore
     */
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
    require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}

/**
 * PHPExcel_Calculation_DateTime
 *
 * Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license        http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version        ##VERSION##, ##DATE##
 */
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));
    }


    /**
     * 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