FrenchToJD
<?php
/*
* ComputeDateDifference(...)
* Description:
* Calculates the difference between two dates.
*
* Parameter:
* $m0, $d0, $y0 => 1. Moth/Day/Year
* $m1, $d1, $y1 => 2. Moth/Day/Year
*
* Return:
* Difference between given dates in days.
*
* Autor:
* 06.06.2006 - Christian Meyer <ryker@ridgex.net>
*/
function ComputeDateDifference($m0,$d0,$y0,$m1,$d1,$y1)
{
$x0 = gregoriantojd($m0,$d0,$y0);
$x1 = gregoriantojd($m1,$d1,$y1);
$diff = $x1 - $x0;
if ($diff < 0)
$diff *= -1; // abs
return $diff;
}
?>
GregorianToJD
(PHP 4, PHP 5)
GregorianToJD — Konvertuje Gregoriánsky dátum na Juliánske Dni
Popis
int gregoriantojd
( int $mesiac
, int $den
, int $rok
)
Platný rozsah Gregoriánkseho kalendára je od 4714 pred n.l. po 9999 n.l.
I keď táto funkcia dokáže spracovávať dátumy až po rok 4714 pred n.l., takéto použitie nemá zmysel. Gregoriánsky kalendár nebol do 15. októbra 1582 (alebo 5. októbra 1582 v Juliánskom kalendári) zavedený. Niektoré krajiny ho neprijali ani neskoršie. Na príklad, Británia ho zaviedla v 1752, ZSSR v 1918 a Grécko v 1923. Väčšina Európskych krajín pred jeho zavedením používala Juliánsky kalendár.
Example#1 Funkcie kalendára
<?php
$jd = GregorianToJD (10,11,1970);
echo "$jd\n";
$gregorian = JDToGregorian ($jd);
echo "$gregorian\n";
?>
add a note
User Contributed NotesGregorianToJD
ryker at ridgex dot net
06-Jun-2006 08:27
06-Jun-2006 08:27
jettyrat at jettyfishing dot com
17-Mar-2005 01:34
17-Mar-2005 01:34
You can obtain the decimal fraction of the Julian date with the php gregoriantojd() function or the function shown below by applying this code to the returned value.
<?php
$julianDate = gregoriantojd($month, $day, $year);
//correct for half-day offset
$dayfrac = date('G') / 24 - .5;
if ($dayfrac < 0) $dayfrac += 1;
//now set the fraction of a day
$frac = $dayfrac + (date('i') + date('s') / 60) / 60 / 24;
$julianDate = $julianDate + $frac;
?>
httpwebwitch
08-Jun-2004 04:04
08-Jun-2004 04:04
This function also ignores decimal fractions in JD dates, and it uses non-standard format for returning the Gregorian date.
So, if your JD date is 2453056.28673, the Gregorian returned value is 2/20/2004, not "2004-02-20 23:45:36"
The decimal part is important, since the Julian day begins at noon, for example 2453056.49 is on Friday, 2453056.50 is on Saturday. Discarding the decimal part means that your returned Gregorian Date will be wrong 50% of the time.