Re: Microsoft to force new Outlook on Windows 10 PCs

On Thu, 16 Jan 2025 14:40:22 -0600, Physfitfreak wrote:

I wrote programs on them that I'm still using today!
For one, a calendar conversion program I wrote handled conversions
between Iranian lunar, Iranian solar, the Gregorian and before that the
Julian solar dates nicely. Maximum error just one day! And you could go
back in time even to the days of Darius if you insisted, cause I also
took into account the precession of the Earth's rotational axis. I know
of no calendar inversion software (accessible to public) that does that.
They'll get even the season wrong if you go back that far, let alone the
day.
 

I believe that Julian Dates (JD) are used for this purpose.  The JD
is a count of the number of days since January 1, 4713 BCE.

The next step would be to convert the JD to a particular solar or
lunar calendar.

GNU/Linux has complete JD facilities.

I am not sure how the GNU/Linux "cal" command would handle historic
dates before the Julian calendar, which was introduced in 45 BCE.
But I am investigating this issue now because it is, to me, a very
interesting one.

I do know that cal can handle accurately dates during that bizarre
period of Julian-to-Gregorian transition.




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