cal-persia.el disagrees with Iranian calendar in A.D. 2025
eggert at CS.UCLA.EDU
Tue Apr 5 22:02:28 UTC 2005
Roozbeh Pournader <roozbeh at farsiweb.info> writes:
> The text of the Iranian law, in effect since 1925, clearly mentions
> that the true solar year is the measure, and there is no arithmetic
> leap year calculation involved. There has never been any serious
> plan to change that law....
Thanks for making this clear. I'll update the tz database
accordingly; the only year this affects in the current database is
2025 Gregorian (both spring and fall transitions). I'll add Oscar's
comments for years after 2037, as a warning to future maintainers.
> I'm not sure about Birashk's suggested leap year rule ... but a very
> simpler one I checked (using 33-year cycles) will not differ from
> the astronomical one until sometime in the 2070s.
This suggests that cal-persia.el could be changed as well, as its
practical use is (I think) for predicting dates in Iran. I'm hesitant
to propose a change myself, though, as I'm not an expert in either the
calendar or the code.
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