(PHP 3, PHP 4 , PHP 5)

GregorianToJD --  Converts a Gregorian date to Julian Day Count


int gregoriantojd ( int month, int day, int year)

Valid Range for Gregorian Calendar 4714 B.C. to 9999 A.D.

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.

Example 1. Calendar functions

= GregorianToJD(10, 11, 1970);
$gregorian = JDToGregorian($jd);

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