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X. Calendar Functions

Введение

The calendar extension presents a series of functions to simplify converting between different calendar formats. The intermediary or standard it is based on is the Julian Day Count. The Julian Day Count is a count of days starting from January 1st, 4713 B.C. To convert between calendar systems, you must first convert to Julian Day Count, then to the calendar system of your choice. Julian Day Count is very different from the Julian Calendar! For more information on Julian Day Count, visit http://www.hermetic.ch/cal_stud/jdn.htm. For more information on calendar systems visit http://www.boogle.com/info/cal-overview.html. Excerpts from this page are included in these instructions, and are in quotes.

Установка

To get these functions to work, you have to compile PHP with --enable-calendar.

Версия PHP для Windows имеет встроенную поддержку данного расширения. Это означает, что для использования данных функций не требуется загрузка никаких дополнительных расширений.

Настройка во время выполнения

Данное расширение не определяет никакие директивы конфигурации в php.ini.

Типы ресурсов

Данное расширение не определяет никакие типы ресурсов.

Предопределенные константы

Перечисленные ниже константы определены данным расширением и могут быть доступны только в том случае, если PHP был собран с поддержкой этого расширения или же в том случае, если данное расширение подгружается во время выполнения.

CAL_GREGORIAN (integer)

CAL_JULIAN (integer)

CAL_JEWISH (integer)

CAL_FRENCH (integer)

CAL_NUM_CALS (integer)

CAL_DOW_DAYNO (integer)

CAL_DOW_SHORT (integer)

CAL_DOW_LONG (integer)

CAL_MONTH_GREGORIAN_SHORT (integer)

CAL_MONTH_GREGORIAN_LONG (integer)

CAL_MONTH_JULIAN_SHORT (integer)

CAL_MONTH_JULIAN_LONG (integer)

CAL_MONTH_JEWISH (integer)

CAL_MONTH_FRENCH (integer)

The following constants are available since PHP 4.3.0 :

CAL_EASTER_DEFAULT (integer)

CAL_EASTER_ROMAN (integer)

CAL_EASTER_ALWAYS_GREGORIAN (integer)

CAL_EASTER_ALWAYS_JULIAN (integer)

The following constants are available since PHP 5.0.0 :

CAL_JEWISH_ADD_ALAFIM_GERESH (integer)

CAL_JEWISH_ADD_ALAFIM (integer)

CAL_JEWISH_ADD_GERESHAYIM (integer)

Содержание
cal_days_in_month -- Return the number of days in a month for a given year and calendar
cal_from_jd -- Converts from Julian Day Count to a supported calendar
cal_info -- Returns information about a particular calendar
cal_to_jd -- Converts from a supported calendar to Julian Day Count
easter_date --  Get Unix timestamp for midnight on Easter of a given year
easter_days --  Get number of days after March 21 on which Easter falls for a given year
FrenchToJD --  Converts a date from the French Republican Calendar to a Julian Day Count
GregorianToJD --  Converts a Gregorian date to Julian Day Count
JDDayOfWeek -- Returns the day of the week
JDMonthName -- Returns a month name
JDToFrench --  Converts a Julian Day Count to the French Republican Calendar
JDToGregorian -- Converts Julian Day Count to Gregorian date
jdtojewish --  Converts a Julian day count to a Jewish calendar date
JDToJulian --  Converts a Julian Day Count to a Julian Calendar Date
jdtounix -- Convert Julian Day to Unix timestamp
JewishToJD --  Converts a date in the Jewish Calendar to Julian Day Count
JulianToJD --  Converts a Julian Calendar date to Julian Day Count
unixtojd -- Convert Unix timestamp to Julian Day


cal_days_in_month> <bzwrite
Last updated: Fri, 26 Jan 2007
 
add a note add a note User Contributed Notes
Calendar Functions
Martin Lindhe
27-Sep-2007 05:08
To calculate NTP timestamp from unix timestamp:

<?
function ntptime()
{
    return 2208988800 + time();
}
?>

NTP timestamps are represented as a 64-bit unsigned fixed-
point number, in seconds relative to 0h on 1 January 1900.
schotm29 at hotmail dot com
07-Sep-2007 06:00
fRay Fergusons light reimplimentation doesn't work all of the time, because of the inaccuracy in the calculations (it is quite accurate but not accurate enough for a live web app)
david dot scourfield at llynfi dot co dot uk
17-Aug-2007 03:13
I created this function a while ago and needed it again recently, so had to trawl through some old files to find it. Thought I'd post it here in case anyone else finds it useful.

<?php

/*
 *    Function to calculate which days are British bank holidays (England & Wales) for a given year.
 *
 *    Created by David Scourfield, 07 August 2006, and released into the public domain.
 *    Anybody may use and/or modify this code.
 *
 *    USAGE:
 *
 *    array calculateBankHolidays(int $yr)
 *
 *    ARGUMENTS
 *
 *    $yr = 4 digit numeric representation of the year (eg 1997).
 *
 *    RETURN VALUE
 *
 *    Returns an array of strings where each string is a date of a bank holiday in the format "yyyy-mm-dd".
 *
 *    See example below
 *
 */

function calculateBankHolidays($yr) {

    $bankHols = Array();

    // New year's:
    switch ( date("w", strtotime("$yr-01-01 12:00:00")) ) {
        case 6:
            $bankHols[] = "$yr-01-03";
            break;
        case 0:
            $bankHols[] = "$yr-01-02";
            break;
        default:
            $bankHols[] = "$yr-01-01";
    }

    // Good friday:
    $bankHols[] = date("Y-m-d", strtotime( "+".(easter_days($yr) - 2)." days", strtotime("$yr-03-21 12:00:00") ));

    // Easter Monday:
    $bankHols[] = date("Y-m-d", strtotime( "+".(easter_days($yr) + 1)." days", strtotime("$yr-03-21 12:00:00") ));

    // May Day:
    if ($yr == 1995) {
        $bankHols[] = "1995-05-08"; // VE day 50th anniversary year exception
    } else {
        switch (date("w", strtotime("$yr-05-01 12:00:00"))) {
            case 0:
                $bankHols[] = "$yr-05-02";
                break;
            case 1:
                $bankHols[] = "$yr-05-01";
                break;
            case 2:
                $bankHols[] = "$yr-05-07";
                break;
            case 3:
                $bankHols[] = "$yr-05-06";
                break;
            case 4:
                $bankHols[] = "$yr-05-05";
                break;
            case 5:
                $bankHols[] = "$yr-05-04";
                break;
            case 6:
                $bankHols[] = "$yr-05-03";
                break;
        }
    }

    // Whitsun:
    if ($yr == 2002) { // exception year
        $bankHols[] = "2002-06-03";
        $bankHols[] = "2002-06-04";
    } else {
        switch (date("w", strtotime("$yr-05-31 12:00:00"))) {
            case 0:
                $bankHols[] = "$yr-05-25";
                break;
            case 1:
                $bankHols[] = "$yr-05-31";
                break;
            case 2:
                $bankHols[] = "$yr-05-30";
                break;
            case 3:
                $bankHols[] = "$yr-05-29";
                break;
            case 4:
                $bankHols[] = "$yr-05-28";
                break;
            case 5:
                $bankHols[] = "$yr-05-27";
                break;
            case 6:
                $bankHols[] = "$yr-05-26";
                break;
        }
    }

    // Summer Bank Holiday:
    switch (date("w", strtotime("$yr-08-31 12:00:00"))) {
        case 0:
            $bankHols[] = "$yr-08-25";
            break;
        case 1:
            $bankHols[] = "$yr-08-31";
            break;
        case 2:
            $bankHols[] = "$yr-08-30";
            break;
        case 3:
            $bankHols[] = "$yr-08-29";
            break;
        case 4:
            $bankHols[] = "$yr-08-28";
            break;
        case 5:
            $bankHols[] = "$yr-08-27";
            break;
        case 6:
            $bankHols[] = "$yr-08-26";
            break;
    }

    // Christmas:
    switch ( date("w", strtotime("$yr-12-25 12:00:00")) ) {
        case 5:
            $bankHols[] = "$yr-12-25";
            $bankHols[] = "$yr-12-28";
            break;
        case 6:
            $bankHols[] = "$yr-12-27";
            $bankHols[] = "$yr-12-28";
            break;
        case 0:
            $bankHols[] = "$yr-12-26";
            $bankHols[] = "$yr-12-27";
            break;
        default:
            $bankHols[] = "$yr-12-25";
            $bankHols[] = "$yr-12-26";
    }

    // Millenium eve
    if ($yr == 1999) {
        $bankHols[] = "1999-12-31";
    }

    return $bankHols;

}

/*
 *    EXAMPLE:
 *
 */

header("Content-type: text/plain");

$bankHolsThisYear = calculateBankHolidays(2007);

print_r($bankHolsThisYear);

?>

Will output this result:

Array
(
    [0] => 2007-01-01
    [1] => 2007-04-06
    [2] => 2007-04-09
    [3] => 2007-05-07
    [4] => 2007-05-28
    [5] => 2007-08-27
    [6] => 2007-12-25
    [7] => 2007-12-26
)
fRay Ferguson
21-Apr-2006 07:32
The following is a light reimplimentation of some of these functions wich can be used in an include file to work around the lack of --with-calendar in php implimentations.

<?php

/* IMPLEMENTS SUBSET OF PHP CALENDAR FUNCTIONS ON SYSTEMS COMPILED W/O --enable-calendar */

if (!function_exists('cal_days_in_month')){
        function cal_days_in_month($a_null, $a_month, $a_year) {
                return date('t', mktime(0, 0, 0, $a_month+1, 0, $a_year));
        }
}

if (!function_exists('cal_to_jd')){
        function cal_to_jd($a_null, $a_month, $a_day, $a_year){
                if ( $a_month <= 2 ){
                     $a_month = $a_month + 12 ;
                     $a_year = $a_year - 1 ;
                }
                $A = intval($a_year/100);
                $B = intval($A/4) ;
                $C = 2-$A+$B ;
                $E = intval(365.25*($a_year+4716)) ;
                $F = intval(30.6001*($a_month+1));
                return intval($C+$a_day+$E+$F-1524) ;
        }
}

if (!function_exists('get_jd_dmy')) {
   function get_jd_dmy($a_jd){
     $W = intval(($a_jd - 1867216.25)/36524.25) ;
     $X = intval($W/4) ;
     $A = $a_jd+1+$W-$X ;
     $B = $A+1524 ;
     $C = intval(($B-122.1)/365.25) ;
     $D = intval(365.25*$C) ;
     $E = intval(($B-$D)/30.6001) ;
     $F = intval(30.6001*$E) ;
     $a_day = $B-$D-$F ;
     if ( $E > 13 ) {
        $a_month=$E-13 ;
        $a_year = $C-4715 ;
     } else {
        $a_month=$E-1 ;
        $a_year=$C-4716 ;
     }
     return array($a_month, $a_day, $a_year) ;
   }
}

if (!function_exists('jdmonthname')) {
        function jdmonthname($a_jd,$a_mode){
                $tmp = get_jd_dmy($a_jd) ;
                $a_time = "$tmp[0]/$tmp[1]/$tmp[2]" ;
                switch($a_mode) {
                        case 0:
                                return strftime("%b",strtotime("$a_time")) ;
                        case 1:
                                return strftime("%B",strtotime("$a_time")) ;
                }
        }
}

if (!function_exists('jddayofweek')) {
        function jddayofweek($a_jd,$a_mode){
                $tmp = get_jd_dmy($a_jd) ;
                $a_time = "$tmp[0]/$tmp[1]/$tmp[2]" ;
                switch($a_mode) {
                        case 1:
                                return strftime("%A",strtotime("$a_time")) ;
                        case 2:
                                return strftime("%a",strtotime("$a_time")) ;
                        default:
                                return strftime("%w",strtotime("$a_time")) ;
                }
        }
}

?>
amichauer at gmx dot de
27-Jun-2005 09:46
<?php

class HijriCalendar
{
    function monthName($i) // $i = 1..12
    {
        static $month  = array(
            "M
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