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PHP JulianToJD() Function

PHP Calendar Reference Complete PHP Calendar Reference

Definition and Usage

The JulianToJD() function converts a Julian calendar date to a Julian day count.

Syntax

juliantojd(month,day,year)

Parameter Description
month Required. Specifies the month
day Required. Specifies the day
year Required. Specifies the year. Valid range is 4713 B.C. to 9999 A.D.

Tips and Notes

Note: Although this function can handle dates back to 4713 B.C., you should notice that the Julian calendar was created in 46 B.C., and it did not stabilize until at least 8 A.D. Also, the beginning of a year varied from one culture to another - not all accepted January as the first month. Remember that the current calendar being used worldwide is the Gregorian calendar. The gregoriantojd() function can be used to convert such dates to their Julian Day count.

Example

<?php
$jd = juliantojd(10,3,1975);
echo($jd . "<br />");

$julian = jdtojulian($jd);
echo($julian);
?>

The output of the code above will be:

2442702
10/3/1975

PHP Calendar Reference Complete PHP Calendar Reference
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