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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: What about my last date functions? there are some error?
Date: Tue, 08 Nov 2016 12:29:59 -0800
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Keith Thompson <kst-u@mib.org> writes:
[...]
> A Julian Day Number (JDN) is the whole number of days since noon,
> Jan 1, 4713 BCE.

And that date is specified in the proleptic Julian calendar.
("Proleptic" means that the rules of the Julian calendar, with one leap
year every 4 years, are extrapolated back to before the calendar was
instituted.)

[...]

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"