   #PHP Manual Calendar functions FrenchToJD JDDayOfWeek

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                                 GregorianToJD

   (PHP 3, PHP 4 )
   GregorianToJD --  Converts a Gregorian date to Julian Day Count

Description

   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
   <?php
   $jd = GregorianToJD(10, 11, 1970);
   echo "$jd\n";
   $gregorian = JDToGregorian($jd);
   echo "$gregorian\n";
   ?>
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