Valid Range for Julian Calendar 4713 B.C. to 9999
A.D.
Although this function can handle dates all the way back
to 4713 B.C., such use may not be meaningful. The calendar
was created in 46 B.C., but the details did not stabilize
until at least 8 A.D., and perhaps as late at the 4th
century. Also, the beginning of a year varied from one
culture to another - not all accepted January as the first
month.
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