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""" Calculate moveable feasts that depend on the date of Easter Sunday.
Copyright (c) 1998-2000, Marc-Andre Lemburg; mailto:mal@lemburg.com
Copyright (c) 2000-2015, eGenix.com Software GmbH; mailto:info@egenix.com
See the documentation for further information on copyrights,
or contact the author. All Rights Reserved.
"""
import DateTime
_eastereggs = {}
def EasterSunday(year):
"""EasterSunday(year)
Return a DateTime instance pointing to Easter Sunday of the given
year. Note: it must be given *with* century.
Based on the algorithm presented in the Calendar FAQ by Claus
Tondering (http://www.pip.dknet.dk/~pip10160/calendar.html), which
in return is based on the algorithm of Oudin (1940) as quoted in
"Explanatory Supplement to the Astronomical Almanac", P. Kenneth
Seidelmann, editor."""
if _eastereggs.has_key(year):
return _eastereggs[year]
G = year % 19
C = year/100
H = (C - C/4 - (8*C+13)/25 + 19*G + 15) % 30
I = H - (H/28)*(1 - (H/28)*(29/(H + 1))*((21 - G)/11))
J = (year + year/4 + I + 2 - C + C/4) % 7
L = I - J
month = 3 + (L + 40)/44
day = L + 28 - 31*(month/4)
_eastereggs[year] = d = DateTime.DateTime(year,month,day)
return d
Ostersonntag = EasterSunday
DimanchePaques = EasterSunday
# Some common feasts derived from Easter Sunday
def CarnivalMonday(year):
return EasterSunday(year) - 48
Rosenmontag = CarnivalMonday
def MardiGras(year):
return EasterSunday(year) - 47
def AshWednesday(year):
return EasterSunday(year) - 46
Aschermittwoch = AshWednesday
MercrediCendres = AshWednesday
def PalmSunday(year):
return EasterSunday(year) - 7
Palmsonntag = PalmSunday
DimancheRameaux = PalmSunday
def EasterFriday(year):
return EasterSunday(year) - 2
GoodFriday = EasterFriday
Karfreitag = EasterFriday
VendrediSaint = EasterFriday
def EasterMonday(year):
return EasterSunday(year) + 1
Ostermontag = EasterMonday
LundiPaques = EasterMonday
def Ascension(year):
return EasterSunday(year) + 39
Himmelfahrt = Ascension
def Pentecost(year):
return EasterSunday(year) + 49
WhitSunday = Pentecost
Pfingstsonntag = WhitSunday
DimanchePentecote = WhitSunday
def WhitMonday(year):
return EasterSunday(year) + 50
Pfingstmontag = WhitMonday
LundiPentecote = WhitMonday
def TrinitySunday(year):
return EasterSunday(year) + 56
def CorpusChristi(year):
return EasterSunday(year) + 60
Fronleichnam = CorpusChristi
FeteDieu = CorpusChristi
def _test():
import ISO,ARPA
print 'Easter Sunday for the next few years'
for year in range(2000, 2038):
easter = EasterSunday(year)
mark = easter.month == 4 and easter.day == 6
print 'ISO:',ISO.str(easter),' ARPA:', ARPA.str(easter), ' *' * mark
if __name__ == '__main__':
_test()