calc.php

国外很不错的一个开源OA系统Group-Office

<?php

// The constant telling us what day starts the week. Monday (1) is the
// international standard. Redefine this to 0 if you want weeks to
// begin on Sunday.
if (!defined('DATE_CALC_BEGIN_WEEKDAY')) {
    define('DATE_CALC_BEGIN_WEEKDAY', 1);
}

/**
 * go_date_Calc is a calendar class used to calculate and
 * manipulate calendar dates and retrieve dates in a calendar
 * format. It does not rely on 32-bit system date stamps, so
 * you can display calendars and compare dates that date
 * pre 1970 and post 2038.
 *
 * This source file is subject to version 2.02 of the PHP license,
 * that is bundled with this package in the file LICENSE, and is
 * available at through the world-wide-web at
 * http://www.php.net/license/2_02.txt.
 * If you did not receive a copy of the PHP license and are unable to
 * obtain it through the world-wide-web, please send a note to
 * [e-mail] so we can mail you a copy immediately.
 *
 * Copyright (c) 1999, 2002, 2003 ispi
 *
 * @access public
 *
 * @version 1.2.6
 * @author Monte Ohrt <[e-mail]>
 */

class go_date_Calc
{
    /**
     * Returns the current local date. NOTE: This function
     * retrieves the local date using strftime(), which may
     * or may not be 32-bit safe on your system.
     *
     * @param string the strftime() format to return the date
     *
     * @access public
     *
     * @return string the current date in specified format
     */

    function dateNow($format='%Y%m%d')
    {
        return(strftime($format,time()));

    } // end func dateNow

     /**
     * Returns true for valid date, false for invalid date.
     *
     * @param string year in format CCYY
     * @param string month in format MM
     * @param string day in format DD
     *
     * @access public
     *
     * @return boolean true/false
     */

    function isValidDate($day, $month, $year)
    {
        if ($year < 0 || $year > 9999) {
            return false;
        }
        if (!checkdate($month,$day,$year)) {
            return false;
        }

        return true;
    } // end func isValidDate

     /**
     * Returns true for a leap year, else false
     *
     * @param string year in format CCYY
     *
     * @access public
     *
     * @return boolean true/false
     */

    function isLeapYear($year='')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }

        if (preg_match('/\D/',$year)) {
            return false;
        }

        if ($year < 1000) {
            return false;
        }

        if ($year < 1582) {
            // pre Gregorio XIII - 1582
            return ($year % 4 == 0);
        } else {
            // post Gregorio XIII - 1582
            return ( (($year % 4 == 0) and ($year % 100 != 0)) or ($year % 400 == 0) );
        }
    } // end func isLeapYear

    /**
     * Determines if given date is a future date from now.
     *
     * @param string day in format DD
     * @param string month in format MM
     * @param string year in format CCYY
     *
     * @access public
     *
     * @return boolean true/false
     */

    function isFutureDate($day,$month,$year)
    {
        $this_year = go_date_Calc::dateNow('%Y');
        $this_month = go_date_Calc::dateNow('%m');
        $this_day = go_date_Calc::dateNow('%d');

        if ($year > $this_year) {
            return true;
        } elseif ($year == $this_year) {
            if ($month > $this_month) {
                return true;
            } elseif ($month == $this_month) {
                if ($day > $this_day) {
                    return true;
                }
            }
        }

        return false;
    } // end func isFutureDate

    /**
     * Determines if given date is a past date from now.
     *
     * @param string day in format DD
     * @param string month in format MM
     * @param string year in format CCYY
     *
     * @access public
     *
     * @return boolean true/false
     */

    function isPastDate($day,$month,$year)
    {
        $this_year = go_date_Calc::dateNow('%Y');
        $this_month = go_date_Calc::dateNow('%m');
        $this_day = go_date_Calc::dateNow('%d');

        if ($year < $this_year) {
            return true;
        } elseif ($year == $this_year) {
            if ($month < $this_month) {
                return true;
            } elseif ($month == $this_month) {
                if ($day < $this_day) {
                    return true;
                }
            }
        }

        return false;
    } // end func isPastDate

    /**
     * Returns day of week for given date, 0=Sunday
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     *
     * @access public
     *
     * @return int $weekday_number
     */

    function dayOfWeek($day='',$month='',$year='')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }

        if ($month > 2) {
            $month -= 2;
        } else {
            $month += 10;
            $year--;
        }

        $day = ( floor((13 * $month - 1) / 5) +
            $day + ($year % 100) +
            floor(($year % 100) / 4) +
            floor(($year / 100) / 4) - 2 *
            floor($year / 100) + 77);

        $weekday_number = (($day - 7 * floor($day / 7)));

        return $weekday_number;
    } // end func dayOfWeek

    /**
     * Returns week of the year, first Sunday is first day of first week
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     *
     * @access public
     *
     * @return integer $week_number
     */

    function weekOfYear($day='',$month='',$year='')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }
        $iso    = go_date_Calc::gregorianToISO($day, $month, $year);
        $parts  = explode('-',$iso);
        $week_number = intval($parts[1]);
        return $week_number;
    } // end func weekOfYear

    /**
     * Returns number of days since 31 December of year before given date.
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     *
     * @access public
     *
     * @return int $julian
     */

    function julianDate($day='',$month='',$year='')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }

        $days = array(0,31,59,90,120,151,181,212,243,273,304,334);

        $julian = ($days[$month - 1] + $day);

        if ($month > 2 && go_date_Calc::isLeapYear($year)) {
            $julian++;
        }

        return($julian);
    } // end func julianDate

    /**
     * Returns quarter of the year for given date
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     *
     * @access public
     *
     * @return int $year_quarter
     */

    function quarterOfYear($day='',$month='',$year='')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }

        $year_quarter = (intval(($month - 1) / 3 + 1));

        return $year_quarter;
    } // end func quarterOfYear

    /**
     * Returns date of begin of next month of given date.
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function beginOfNextMonth($day='',$month='',$year='',$format='%Y%m%d')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }

        if ($month < 12) {
            $month++;
            $day=1;
        } else {
            $year++;
            $month=1;
            $day=1;
        }

        return go_date_Calc::dateFormat($day,$month,$year,$format);
    } // end func beginOfNextMonth

    /**
     * Returns date of the last day of next month of given date.
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function endOfNextMonth($day='',$month='',$year='',$format='%Y%m%d')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }

        if ($month < 12) {
            $month++;
        } else {
            $year++;
            $month=1;
        }

        $day = go_date_Calc::daysInMonth($month,$year);

        return go_date_Calc::dateFormat($day,$month,$year,$format);
    } // end func endOfNextMonth

    /**
     * Returns date of the first day of previous month of given date.
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function beginOfPrevMonth($day='',$month='',$year='',$format='%Y%m%d')
    {
        if (empty($year)) {
            $year = go_date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = go_date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = go_date_Calc::dateNow('%d');
        }

        if ($month > 1) {
            $month--;
            $day=1;
        } else {
            $year--;
            $month=12;
            $day=1;
        }

        return go_date_Calc::dateFormat($day,$month,$year,$format);
    } // end func beginOfPrevMonth

    /**
     * Returns date of the last day of previous month for given date.
     *
     * @param string day in format DD, default is current local day
     * @param string month in format MM, default is current local month
     * @param string year in format CCYY, default is current local year
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */