method julian-date

Documentation for method julian-date assembled from the following types:

class DateTime

From DateTime

(DateTime) method julian-date

Defined as:

method julian-date(DateTime:D: --> Real:D)

Returns the Julian date (JD) for the UTC date and time.

say'2021-12-24T12:23:00.43Z').julian-date# OUTPUT: «2459573.0159772␤»

The julian-date starts at zero at the epoch of noon UTC on November 24, 4714 B.C. on the proleptic Gregorian calendar (the calendar in use in much of the world and in international commerce and travel). The JD is used in astronomy to define times of celestial objects transiting the Earth's Prime Meridian. For any instant, it is the sum of the number of whole days and the fraction of a day from that epoch to that instant.