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
)
X. カレンダー関数
導入
カレンダー関数は、異なったカレンダーフォーマット間の変換を 簡単に行う関数の集まりです。標準としているのは、ユリウス積算日です。 ユリウス積算日は、紀元前 4713 年 1 月 1 日から数え始めわれています。 カレンダーシステム間の変換を行うには、ユリウス積算日に変換した後 に選択したカレンダーシステムに変換しなければなりません。 ユリウス積算日はユリウス暦とは全く違います! ユリウス積算日の詳細を知りたい場合は、 » http://www.hermetic.ch/cal_stud/jdn.htm を参照ください。 カレンダーシステムに関する情報を知りたい場合は、 » http://www.fourmilab.ch/documents/calendar/ を参照ください。 本説明にはこのページからの引用が含まれています。 このページの内容はこのチュートリアルにも反映/引用されています。
インストール手順
これらの関数を動作させるには、 --enable-calendar を指定して PHP をコンパイルする必要があります。
Windows 版の PHP には この拡張モジュールのサポートが組み込まれています。これらの関数を使用 するために拡張モジュールを追加でロードする必要はありません。
実行時設定
設定ディレクティブは定義されていません。
リソース型
リソース型は定義されていません。
定義済み定数
以下の定数が定義されています。 この関数の拡張モジュールが PHP 組み込みでコンパイルされているか、 実行時に動的にロードされている場合のみ使用可能です。
- 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)
以下の定数は、PHP 4.3.0 以降で使用可能です。
以下の定数は、PHP 5.0.0 以降で使用可能です。
目次
- cal_days_in_month — 指定した年とカレンダーについて、月の日数を返す
- cal_from_jd — ユリウス積算日からサポートされるカレンダーに変換する
- cal_info — 特定のカレンダーに関する情報を返す
- cal_to_jd — サポートされるカレンダーからユリウス積算日に変換する
- easter_date — 指定した年における復活祭の真夜中のUnix時を得る
- easter_days — 指定した年において、3 月 21 日から復活祭までの日数を得る
- FrenchToJD — フランス革命暦をユリウス積算日に変換する
- GregorianToJD — グレゴリウス日をユリウス積算日に変換する
- JDDayOfWeek — 曜日を返す
- JDMonthName — 月の名前を返す
- JDToFrench — ユリウス積算日をフランス革命暦(共和暦)に変換する
- JDToGregorian — ユリウス積算日をグレゴリウス日に変換する
- jdtojewish — ユリウス積算日をユダヤ暦に変換する
- JDToJulian — ユリウス積算日をユリウス暦に変換する
- jdtounix — ユリウス歴を Unix タイムスタンプに変換する
- JewishToJD — ユダヤ暦の日付けをユリウス積算日に変換する
- JulianToJD — ユリウス暦をユリウス積算日に変換する
- unixtojd — Unix タイムスタンプをユリウス歴に変換する
カレンダー関数
david dot scourfield at llynfi dot co dot uk
17-Aug-2007 07:13
17-Aug-2007 07:13
fRay Ferguson
21-Apr-2006 11:32
21-Apr-2006 11:32
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
28-Jun-2005 01:46
28-Jun-2005 01:46
<?php
class HijriCalendar
{
function monthName($i) // $i = 1..12
{
static $month = array(
"Mxrrm", "Safar", "Rabig-l-wwl", "Rabig-l-Axr",
"Cmd-l-wwl", "Cmd-l-Axr", "Racb", "bn",
"Ramazan", "wl", "Z-l-Qd", "Z-l-Xicc"
);
return $month[$i-1];
}
function GregorianToHijri($time = null)
{
if ($time === null) $time = time();
$m = date('m', $time);
$d = date('d', $time);
$y = date('Y', $time);
return HijriCalendar::JDToHijri(
cal_to_jd(CAL_GREGORIAN, $m, $d, $y));
}
function HijriToGregorian($m, $d, $y)
{
return jd_to_cal(CAL_GREGORIAN,
HijriCalendar::HijriToJD($m, $d, $y));
}
# Julian Day Count To Hijri
function JDToHijri($jd)
{
$jd = $jd - 1948440 + 10632;
$n = (int)(($jd - 1) / 10631);
$jd = $jd - 10631 * $n + 354;
$j = ((int)((10985 - $jd) / 5316)) *
((int)(50 * $jd / 17719)) +
((int)($jd / 5670)) *
((int)(43 * $jd / 15238));
$jd = $jd - ((int)((30 - $j) / 15)) *
((int)((17719 * $j) / 50)) -
((int)($j / 16)) *
((int)((15238 * $j) / 43)) + 29;
$m = (int)(24 * $jd / 709);
$d = $jd - (int)(709 * $m / 24);
$y = 30*$n + $j - 30;
return array($m, $d, $y);
}
# Hijri To Julian Day Count
function HijriToJD($m, $d, $y)
{
return (int)((11 * $y + 3) / 30) +
354 * $y + 30 * $m -
(int)(($m - 1) / 2) + $d + 1948440 - 385;
}
};
$hijri = HijriCalendar::GregorianToHijri( time() );
echo $hijri[1].'. '.HijriCalendar::monthName($hijri[0]).' '.$hijri[2];
?>
jthome at fcgov dot com
03-Oct-2003 03:38
03-Oct-2003 03:38
Had a similar problem as curlee, except I needed to create a JDE_ERP date. [format is CYYDDD]
<?php
function jde_date_create($month, $day, $year){
/*
* NOTE: $month and $day CANNOT have leading zeroes,
* $year must be'YYYY' format
*/
$jde_year_prefix = substr($year, 0, 1) - 1;
$jde_year_suffix = substr($year, -2);
//note that valid years for mktime are 1902-2037
$timestamp = mktime(0,0,0,$month, $day, $year);
$baseline_timestamp = mktime(0,0,0,1,0,$year);
$day_count = round(($timestamp - $baseline_timestamp)/86400);
$day_count_padded = str_pad($day_count,3,"0",STR_PAD_LEFT);
return ($jde_year_prefix . $jde_year_suffix . $day_count_padded);
}
echo jde_date_create(6,25,2000);// will return '103176'
?>
--
Jim
curlee at mindspring dot com
30-Aug-2003 12:55
30-Aug-2003 12:55
I solved a problem with Julian dates that are used in the JD Edwards ERP package (running on AS/400). The Julian format for this system is as follows: CYYDDD
Where C is 0 for 1900 and 1 for 2000
DDD is the day of the year count
I used the mktime built-in php function to convert dates to the normal DD/MM/YYYY format. This function will convert dates that are between 1970 and 2038 (limitation of unix timestamps and the mktime function)
The $jde_date var needs to be a 6 len STRING.... if you use a numeric var type it will drop the leading 0 for any date that represents 1900.... this will botch the substr functions and thus make the whole thing wrong.
function jde_date_conv($jde_date)
{
$ct = substr($jde_date,0,1);
$yr = substr($jde_date,1,2);
$dy = substr($jde_date,3,3);
if($ct == 0) $yr_pfx = 19;
if($ct == 1) $yr_pfx = 20;
$tlt_yr = $yr_pfx.$yr;
$base_time = mktime(0,0,0,1,0,$tlt_yr);
$unix_time = ($dy * 86400) + $base_time;
return date("m/d/Y" , $unix_time);
}
carlj at vibez dot ca
17-Jun-2003 04:28
17-Jun-2003 04:28
Why not do something like this, to find the number of days in a month?
$monthNum = date("n"); // or any value from 1-12
$year = date("Y"); // or any value >= 1
$numDays = date("t",mktime(0,0,0,$monthNum,1,$year))
This will tell you if there is 28-31 days in a month
dy64 at dy64 dot de
12-Nov-2002 11:18
12-Nov-2002 11:18
Best performance:
/*
* Find the number of days in a month
* Year is between 1 and 32767 inclusive
* Month is between 1 and 12 inclusive
*/
function DayInMonth($month, $year) {
var $daysInMonth = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
if ($month != 2) return $daysInMonth[$month - 1];
return (checkdate($month, 29, $year)) ? 29 : 28;
}
kmcm at bigfoot dot com
21-Jan-2002 11:42
21-Jan-2002 11:42
if, like me, you don't have a PHP build that includes the cal functions, you may want to use this function for sorting out leap year.
function days_in_feb($year){
//$year must be YYYY
//[gregorian] leap year math :
if ($year < 0) $year++;
$year += 4800;
if ( ($year % 4) == 0) {
if (($year % 100) == 0) {
if (($year % 400) == 0) {
return(29);
} else {
return(28);
}
} else {
return(29);
}
} else {
return(28);
}
}
of course the next leap year isn't until the end of the century but this makes for timeless code I guess ...or if you are using 2000 in your dates or are going far back in time, etc, it is necessary.
mikebabcock at pobox dot com
18-Jul-2000 01:20
18-Jul-2000 01:20
There are two world calculations for the date of Easter. The Easter date function should account for this; one used (generally) by the Western world and one (generally) used by the Eastern (the official date used by the East Orthodox Church).
ssharma at odc dot net
31-Jan-2000 08:36
31-Jan-2000 08:36
If you're interested in dates/calendars, check out the MCAL stuff.
http://www.php.net/manual/ref.mcal.php3