GregorianToJD
(PHP 4, PHP 5)
GregorianToJD — Converts a Gregorian date to Julian Day Count
Description
int gregoriantojd
( int $month
, int $day
, int $year
)
Although this function can handle dates all the way back to 4714
B.C., such use may not be meaningful. The Gregorian calendar was
not instituted until October 15, 1582 (or October 5, 1582 in the
Julian calendar). Some countries did not accept it until much
later. For example, Britain converted in 1752, The USSR in 1918
and Greece in 1923. Most European countries used the Julian
calendar prior to the Gregorian.
Parameters
-
month
-
The month as a number from 1 (for January) to 12 (for December)
-
day
-
The day as a number from 1 to 31
-
year
-
The year as a number between -4714 and 9999
Return Values
The julian day for the given gregorian date as an integer.
Examples
Example #1 Calendar functions
<?php
$jd = GregorianToJD(10, 11, 1970);
echo "$jd\n";
$gregorian = JDToGregorian($jd);
echo "$gregorian\n";
?>
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