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> Oracle January 1, 4712 B.C. to December 31, 4712
> In 46 B.C., Julius Caesar retroactively declared January 1, 4712
> to be the first day of the Julian calendar.
> RDB November 17, 1858 to December 31, 9999
> November 17, 1858 is the date the Smithsonian was founded.
> I don't know why DEC chose that date.
I think RDB is using what is called a "Modified Julian Date". The
NIST dial-up atomic clock in Denver CO gives dates in MJD form. I
back-calculated it, and it turned out to be this 17 Nov date. I
suspect, but have not confirmed, that this is the date "the odometer
rolled over" in the more conventional Julian Date that Oracle is
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