VI. Kalend��ov� funkce

�vod

Toto roz��en� p�edstavuje sadu funkc� ur�en�ch ke zjednodu�en� p�evod� mezi r�zn�mi kalend��i. Prost�edn�kem nebo standardem, na kter�m je zalo�ena, je Julian Day Count. To je po�et dn� za��naj�c� daleko p�ed jak�mkoli datem o kter� by se v�t�ina lid� zaj�mala (n�kde kolem 4000 p�. n. l.). Pokud chcete p�ev�d�t mezi kalend��ov�mi syst�my, mus�te nejd��v p�ev�st na Julian Day Count, potom na k��en� kalend��. Julian Day Count se velmi li�� od Juli�nsk�ho kaled��e! Pro v�ce informac� o Julian Day Count viz . Pro v�ce informac� o kalend��ov�ch syst�mech viz . Tyto instrukce obsahuj� v��atky z t�to str�nky (v uvozovk�ch).

Instalace

Pro pr�ci tohoto roz��en� mus�te PHP zkompilovat s volbou --enable-calendar.

Verze PHP pro Windows m� vestav�nou podporu pro toto roz��en�. K pou�it� t�chto funkc� nen� t�eba na��tat ��dn� dal�� roz��en�.

Konfigurace b�hu

Toto roz��en� nem� definov�no ��dn� konfigura�n� direktivy.

Typy prost�edk�

Toto roz��en� nem� definov�n ��dn� typ prost�edku (resource).

P�eddefinovan� konstanty

Tyto konstanty jsou definov�ny t�mto roz��en�m a budou k dispozici pouze tehdy, bylo-li roz��en� zkompilov�no spole�n� s PHP nebo dynamicky zavedeno za b�hu.

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)

Obsah
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 -- Zjistit UNIXov� timestamp Velikono�n� p�lnoci v dan�m roce
easter_days -- Get number of days after March 21 on which Easter falls for a given year
FrenchToJD -- P�ev�st datum z Francouzsk�ho republik�nsk�ho kalend��e na Julian Day Count
GregorianToJD -- P�ev�st Gregori�nsk� datum na Julian Day Count
JDDayOfWeek -- Vr�tit den v t�dnu
JDMonthName -- Vr�tit n�zev m�s�ce
JDToFrench -- P�ev�st Julian Day Count na Francouzsk� republik�nsk� kalend��
JDToGregorian -- P�ev�st Julian Day Count na Gregori�nsk� datum
JDToJewish -- P�ev�st Julian Day Count na idovsk� kalend��
JDToJulian -- P�ev�st Julian Day Count na Juli�nsk� datum
jdtounix -- P�ev�st Julian Day Count na UNIXov� timestamp
JewishToJD -- P�ev�st datum podle idovsk�ho kalend��e na Julian Day Count
JulianToJD -- P�ev�st Juli�nsk� datum na Julian Day Count
unixtojd -- P�ev�st UNIXov� timestamp na Julian Day Count

add a note User Contributed Notes
Kalend��ov� funkce

wasiq911 at hotmail dot com
23-Jun-2004 08:55


sup people!! I made this dynamic calendar for my site and thought I would share it with everybody. It's completely automatic so there's no need to modify anything...except maybe add your own styles of course!



Hope this code helps somebody:



<html>

<body>

  <?php

   // Get the calender info

   $t_days = cal_days_in_month(CAL_GREGORIAN, date("m"), date("Y"));

   $day = date("w", mktime(0, 0, 0, date("m"), 1, date("Y")));

  ?>



  <table border = "1">

   <tr><th bgcolor = "yellow" colspan = "7"><?php echo date("F Y"); ?></th></tr>

   <tr><th>Sun</th><th>Mon</th><th>Tue</th>

       <th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th></tr>



   <?php

   for ($i = 0; $i <= $t_days; $i++)

   {

     if ($day > 6) {

       echo "</tr>\n<tr>\n";

       $day = 0; }

     //------------------------------------------------//

     if ($i == date("j")) {?>

        <td align = "center"><b><?php echo $i; $day++; echo "</b></td>\n"; }

     else if ($i > 0) {?>

        <td align = "center"><?php echo $i; $day++; echo "</td>\n"; }

     else if ($day > 0) {?>

        <tr><td colspan = "<?php echo $day; ?>"><?php echo "</td>\n"; }

     //-----------------------------------------------//

     if ($i == $t_days && $day < 6) {?>

        <td colspan = "<?php echo 7 - $day; ?>"><?php echo "</td>\n</tr>\n"; }

   }?>

  </table>

</body>

</html>



The above code creates a small and simple calendar table which highlights the current day in bold. I also took the time to make the source code well formatted.

pouya
03-Apr-2004 06:39


There is an implementation of the Persian calendar at www.farsiweb.info.

amichauer at NOSPAM dot gmx dot de
06-Dec-2003 01:07


Where is CAL_HIJRI?



# 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($d, $m, $y);

}



# Hijri To Julian Day Count

function HijriToJD($d, $m, $y)

{

    return (int)((11 * $y + 3) / 30) +

           354 * $y + 30 * $m -

           (int)(($m - 1) / 2) + $d + 1948440 - 385;

}

jthome at fcgov dot com
02-Oct-2003 06:38


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
29-Aug-2003 03:55


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 07:28


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 02:18


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;

}

gaoweibin at 163 dot net
26-Aug-2002 09:26


This is a Chinese Lunar Calendar, including SolarTerm, TianGan, DiZhi, DiesFaustus and Holidays.

kmcm at bigfoot dot com
21-Jan-2002 02:42


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
17-Jul-2000 04:20


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 11:36


If you're interested in dates/calendars, check out the MCAL stuff.

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