[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 ady changed: What|Removed |Added See Also||https://bugs.documentfounda ||tion.org/show_bug.cgi?id=14 ||3912, ||https://bugs.documentfounda ||tion.org/show_bug.cgi?id=15 ||4721 -- You are receiving this mail because: You are the assignee for the bug.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 --- Comment #4 from Mike Kaganski --- (In reply to Mike Kaganski from comment #3) > "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. Indeed, not "early" but "late"; let me quote some Wikipedia: > Some predictive algorithms had been suggested, but were inaccurate due to > confusion between the average tropical year (365.2422 days) and the mean > interval between spring equinoxes (365.2424 days). These algorithms are not > generally used (see Accuracy). > ... > Iranian mathematician Ahmad Birashk (1907–2002) proposed an alternative means > of determining leap years. Birashk's book came out in 1993, and his algorithm > was based on the same apparently erroneous presumptions as used by Zabih > Behruz in his book from 1952. > ... > The accuracy of the system proposed by Birashk and other recent authors, such > as Zabih Behruz, has been thoroughly refuted and shown to be less precise than > the traditional 33-year cycle. -- You are receiving this mail because: You are the assignee for the bug.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 --- Comment #3 from Mike Kaganski --- 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.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 Roland Kurmann changed: What|Removed |Added See Also||https://bugs.documentfounda ||tion.org/show_bug.cgi?id=14 ||9908 -- You are receiving this mail because: You are the assignee for the bug.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 Hossein changed: What|Removed |Added Blocks||149908 Referenced Bugs: https://bugs.documentfoundation.org/show_bug.cgi?id=149908 [Bug 149908] Iranian Calendar into Calc -- You are receiving this mail because: You are the assignee for the bug.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 Roland Kurmann changed: What|Removed |Added CC||i...@scito.ch Status|UNCONFIRMED |NEW Ever confirmed|0 |1 --- Comment #2 from Roland Kurmann --- It would be good to have support for Persian calendar in LibreOffice. -- You are receiving this mail because: You are the assignee for the bug.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 --- Comment #1 from Eike Rathke --- Note that *only* the libjalali sources https://github.com/ashkang/jcal/tree/master/sources/libjalali are licensed LGPLv3+ and could be used as external module, jcal itself is GPLv3+ and as such can not be incorporated into LibreOffice source code. The library is available in Debian as https://packages.debian.org/sid/libjalali0 and in Fedora as https://packages.fedoraproject.org/pkgs/jcal/libjalali/ Original upstream appears to be https://savannah.nongnu.org/projects/jcal/ -- You are receiving this mail because: You are the assignee for the bug.
[Libreoffice-bugs] [Bug 147660] Implement Jalali Calendar in LibreOffice
https://bugs.documentfoundation.org/show_bug.cgi?id=147660 Hossein changed: What|Removed |Added Blocks||143912 Referenced Bugs: https://bugs.documentfoundation.org/show_bug.cgi?id=143912 [Bug 143912] persian calendar dont correct in calc -- You are receiving this mail because: You are the assignee for the bug.
