Definition and Usage
The GregorianToJD() function converts a date from the Gregorian calendar to Julian day count.Syntax
gregoriantojd(month,day,year)
| Parameter | Description |
|---|---|
| month | Required. Specifies the month |
| day | Required. Specifies the day |
| year | Required. Specifies the year. Valid range is from 4714 B.C. to 9999 A.D. |
Tips and Notes
Note: Although this function can handle dates back to 4714 B.C., you should notice that the Gregorian calendar was not instituted until 1582, and some countries did not accept it until much later (Britain converted in 1752, USSR in 1918, and Greece in 1923). Most European countries used the Julian calendar prior to the Gregorian.Example
<?php
$jd = gregoriantojd(10,3,1975);
echo($jd . "<br />");
$gregorian = jdtogregorian($jd);
echo($gregorian);
?>
$jd = gregoriantojd(10,3,1975);
echo($jd . "<br />");
$gregorian = jdtogregorian($jd);
echo($gregorian);
?>
2442689
10/3/1975
10/3/1975