Calender desklet calculates incorrect date for Easter

Thanks for the report!

So, looks like the calculation in "calendar_mod.script" (see lines 65-100) are not correct ?!
Looks hard to say for me, as the whole thing about "calculating the date of Easter Sunday" seems to be... ambiguous ?!

http://en.wikipedia.org/wiki/Computus

Anyone any idea about ít ?

On Tue, 2011-03-15 at 13:40 +0000, Bjoern Koch wrote:
> Thanks for the report!

Welcome.

> So, looks like the calculation in "calendar_mod.script" (see lines
> 65-100) are not correct ?!
> Looks hard to say for me, as the whole thing about "calculating the
> date of Easter Sunday" seems to be... ambiguous ?!
>
> http://en.wikipedia.org/wiki/Computus
>
> Anyone any idea about ít ?

I have a couple of URLs in my bookmarks related to calculating Easter
that might be useful for you:

        http://abledesign.com/programs/holiday_code.php
        http://www.christianwebsite.com/cgi-bin/search/jump.cgi?ID=91886
        http://www.smart.net/~mmontes/ushols.html
        http://guest.engelschall.com/~sb/download/Date-Calc/

I make no representations about the accuracy or applicability of the
above, but at least one includes a description of an algorithm for
determining Easter, and another is obviously for Perl code which
performs the computation...hopefully in a readable fashion, but you know
what they say about Perl being a "write-once" language :)
--
Kevin L. Mitchell <email address hidden>

If you could put it into an icalendar (rfc2445) format, the iCalendarEvent Control could handle it. We'd then need to modify the Calendar desklet to use this Control, bundle it with gDesklets, and add the python-icalendar dep to gDesklets. I think this is a reliable way to handle this (almost annual) problem since this is the internet calendaring standard and there exists at least one calendar file already (https://www.google.com/calendar/ical/en.christian%23holiday%40group.v.calendar.google.com/public/basic.ics).

This should be fixed in 0.36.4. It will require the use of the icalendar python module, but your distro should handle the new dependency. If you want to test it out right now, please check out the desklets-basic repository.