[Korganizer-devel] [Bug 156601] New: Wrong calculation of the Greek-orthodox Easter (pascha) in year 2008. (possibly because of the leap year 2008)

[Michael Grivas]

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http://bugs.kde.org/show_bug.cgi?id=156601         
           Summary: Wrong calculation of the Greek-orthodox Easter (pascha)
                    in year 2008. (possibly because of the leap year 2008)
           Product: korganizer
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: korganizer-devel kde org
        ReportedBy: m_gr_01 yahoo co uk


Version:           4.0 alpha 1  (using KDE 3.94.00) -- BUT running it on GNOME (using KDE 4.0.0)
Installed from:    Ubuntu Packages
Compiler:          I didn't compile anything : gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) 
OS:                Linux

The Greek-orthodox Easter (pascha) for the 2008 is calculated wrongly in 23 of March, while it is on the 27 of April. 
That does not happen in the 2007.
I suspect the difference may be because of the exception of the leap year in the formula of calculation.
The calculcation is (for A1 = year)
MOD(19*MOD(A1;19)+16;30)+MOD(2*MOD(A1;4)+4*MOD(A1;7)+6*MOD(19*MOD(A1;19)+16;30);7)+3
where any number < 31 is the date in April, otherwise it is in May (subtracing 30).