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);
?>
$jd = juliantojd(10,3,1975);
echo($jd . "<br />");
$julian = jdtojulian($jd);
echo($julian);
?>
2442702
10/3/1975
10/3/1975