calc.php

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    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = Date_Calc::dateNow('%d');
        }

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

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

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

    /**
     * Returns date of the next weekday of given date,
     * skipping from Friday to Monday.
     *
     * @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 nextWeekday($day='',$month='',$year='',$format='%Y%m%d')
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = Date_Calc::dateNow('%d');
        }

        $days = Date_Calc::dateToDays($day,$month,$year);

        if (Date_Calc::dayOfWeek($day,$month,$year) == 5) {
            $days += 3;
        } elseif (Date_Calc::dayOfWeek($day,$month,$year) == 6) {
            $days += 2;
        } else {
            $days += 1;
        }

        return(Date_Calc::daysToDate($days,$format));
    } // end func nextWeekday

    /**
     * Returns date of the previous weekday,
     * skipping from Monday to Friday.
     *
     * @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 prevWeekday($day='',$month='',$year='',$format='%Y%m%d')
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = Date_Calc::dateNow('%d');
        }

        $days = Date_Calc::dateToDays($day,$month,$year);

        if (Date_Calc::dayOfWeek($day,$month,$year) == 1) {
            $days -= 3;
        } elseif (Date_Calc::dayOfWeek($day,$month,$year) == 0) {
            $days -= 2;
        } else {
            $days -= 1;
        }

        return(Date_Calc::daysToDate($days,$format));
    } // end func prevWeekday

    /**
     * Returns date of the next specific day of the week
     * from the given date.
     *
     * @param int day of week, 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
     * @param boolean onOrAfter if true and days are same, returns current day
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function nextDayOfWeek($dow,$day='',$month='',$year='',$format='%Y%m%d',$onOrAfter=false)
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = Date_Calc::dateNow('%d');
        }

        $days = Date_Calc::dateToDays($day,$month,$year);
        $curr_weekday = Date_Calc::dayOfWeek($day,$month,$year);

        if ($curr_weekday == $dow) {
            if (!$onOrAfter) {
                $days += 7;
            }
        }
        elseif ($curr_weekday > $dow) {
            $days += 7 - ( $curr_weekday - $dow );
        } else {
            $days += $dow - $curr_weekday;
        }

        return(Date_Calc::daysToDate($days,$format));
    } // end func nextDayOfWeek

    /**
     * Returns date of the previous specific day of the week
     * from the given date.
     *
     * @param int day of week, 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
     * @param boolean onOrBefore if true and days are same, returns current day
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function prevDayOfWeek($dow,$day='',$month='',$year='',$format='%Y%m%d',$onOrBefore=false)
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = Date_Calc::dateNow('%d');
        }

        $days = Date_Calc::dateToDays($day,$month,$year);
        $curr_weekday = Date_Calc::dayOfWeek($day,$month,$year);

        if ($curr_weekday == $dow) {
            if (!$onOrBefore) {
                $days -= 7;
            }
        }
        elseif ($curr_weekday < $dow) {
            $days -= 7 - ( $dow - $curr_weekday );
        } else {
            $days -= $curr_weekday - $dow;
        }

        return(Date_Calc::daysToDate($days,$format));
    } // end func prevDayOfWeek

    /**
     * Returns date of the next specific day of the week
     * on or after the given date.
     *
     * @param int day of week, 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
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function nextDayOfWeekOnOrAfter($dow,$day='',$month='',$year='',$format='%Y%m%d')
    {
        return(Date_Calc::nextDayOfWeek($dow,$day,$month,$year,$format,true));
    } // end func nextDayOfWeekOnOrAfter

    /**
     * Returns date of the previous specific day of the week
     * on or before the given date.
     *
     * @param int day of week, 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
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

    function prevDayOfWeekOnOrBefore($dow,$day='',$month='',$year='',$format='%Y%m%d')
    {
        return(Date_Calc::prevDayOfWeek($dow,$day,$month,$year,$format,true));
    } // end func prevDayOfWeekOnOrAfter

    /**
     * Returns date of day after 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 nextDay($day='',$month='',$year='',$format='%Y%m%d')
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        if (empty($day)) {
            $day = Date_Calc::dateNow('%d');
        }

        $days = Date_Calc::dateToDays($day,$month,$year);

        return(Date_Calc::daysToDate($days + 1,$format));
    } // end func nextDay

    /**
     * Returns date of day 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
     * @param string format for returned date
     *
     * @access public
     *
     * @return string date in given format
     */

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

        $days = Date_Calc::dateToDays($day,$month,$year);

        return(Date_Calc::daysToDate($days - 1,$format));
    } // end func prevDay

    /**
     * Sets century for 2 digit year.
     * 51-99 is 19, else 20
     *
     * @param string 2 digit year
     *
     * @access public
     *
     * @return string 4 digit year
     */

    function defaultCentury($year)
    {
        if (strlen($year) == 1) {
            $year = "0$year";
        }
        if ($year > 50) {
            return( "19$year" );
        } else {
            return( "20$year" );
        }
    } // end func defaultCentury

    /**
     * Returns number of days between two given dates.
     *
    * @param string $day1   day in format DD
    * @param string $month1 month in format MM
    * @param string $year1  year in format CCYY
    * @param string $day2   day in format DD
    * @param string $month2 month in format MM
    * @param string $year2  year in format CCYY
     *
     * @access public
     *
     * @return int absolute number of days between dates,
     *      -1 if there is an error.
     */

    function dateDiff($day1,$month1,$year1,$day2,$month2,$year2)
    {
        if (!Date_Calc::isValidDate($day1,$month1,$year1)) {
            return -1;
        }
        if (!Date_Calc::isValidDate($day2,$month2,$year2)) {
            return -1;
        }

        return(abs((Date_Calc::dateToDays($day1,$month1,$year1))
                    - (Date_Calc::dateToDays($day2,$month2,$year2))));
    } // end func dateDiff

    /**
    * Compares two dates
    *
    * @param string $day1   day in format DD
    * @param string $month1 month in format MM
    * @param string $year1  year in format CCYY
    * @param string $day2   day in format DD
    * @param string $month2 month in format MM
    * @param string $year2  year in format CCYY
    *
    * @access public
    * @return int 0 on equality, 1 if date 1 is greater, -1 if smaller
    */
    function compareDates($day1,$month1,$year1,$day2,$month2,$year2)
    {
        $ndays1 = Date_Calc::dateToDays($day1, $month1, $year1);
        $ndays2 = Date_Calc::dateToDays($day2, $month2, $year2);
        if ($ndays1 == $ndays2) {
            return 0;
        }
        return ($ndays1 > $ndays2) ? 1 : -1;
    } // end func compareDates

    /**
     * Find the number of days in the given month.
     *
     * @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 number of days
     */

    function daysInMonth($month='',$year='')
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }

        if ($year == 1582 && $month == 10) {
            return 21;  // October 1582 only had 1st-4th and 15th-31st
        }

        if ($month == 2) {
            if (Date_Calc::isLeapYear($year)) {
                return 29;
             } else {
                return 28;
            }
        } elseif ($month == 4 or $month == 6 or $month == 9 or $month == 11) {
            return 30;
        } else {
            return 31;
        }
    } // end func daysInMonth

    /**
     * Returns the number of rows on a calendar month. Useful for
     * determining the number of rows when displaying a typical
     * month calendar.
     *
     * @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 number of weeks
     */

    function weeksInMonth($month='',$year='')
    {
        if (empty($year)) {
            $year = Date_Calc::dateNow('%Y');
        }
        if (empty($month)) {
            $month = Date_Calc::dateNow('%m');
        }
        $FDOM = Date_Calc::firstOfMonthWeekday($month, $year);
        if (DATE_CALC_BEGIN_WEEKDAY==1 && $FDOM==0) {
            $first_week_days = 7 - $FDOM + DATE_CALC_BEGIN_WEEKDAY;
            $weeks = 1;
        } elseif (DATE_CALC_BEGIN_WEEKDAY==0 && $FDOM == 6) {
            $first_week_days = 7 - $FDOM + DATE_CALC_BEGIN_WEEKDAY;
            $weeks = 1;
        } else {
            $first_week_days = DATE_CALC_BEGIN_WEEKDAY - $FDOM;
            $weeks = 0;
        }