https://bugs.documentfoundation.org/show_bug.cgi?id=147660
--- Comment #3 from Mike Kaganski <[email protected]> --- First of all, we need some clarity here. Several terms seem mixed, creating confusion and a way to mistakes: Jalali and Hijri Shamsi, which are *different* calendars, the former being a non-algorithmic one, defined by ongoing astronomical observations. The latter one is said to use 33 (sometimes 29) year cycles, also requiring periodical synchronization using astronomical data. But the libjalali, mentioned further, is implemented using 2820 years cycle [1], which is "Birashk leap year algorithm" [2], said to be an *alternative* computation method suggested in early XX century, and to be much less precise than both Jalali and Hijri. The existence of the library in the distro repos sais nothing about its usage to implement system calendar using it. Is it actually used for the purpose? And more importantly - does it match what Excel implemented? We likely need a spreadsheet from Excel with important dates for very large period helping make sure we do it properly. [1] https://git.savannah.nongnu.org/cgit/jcal.git/tree/sources/libjalali/jalali.c#n54 [2] https://en.wikipedia.org/wiki/Solar_Hijri_calendar#Birashk_leap_year_algorithm -- You are receiving this mail because: You are the assignee for the bug.
