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paques.py
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paques.py
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# -*- coding: utf-8 -*-
## This file is part of Gertrude.
##
## Gertrude is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## Gertrude is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gertrude; if not, see <http://www.gnu.org/licenses/>.
import datetime
def getPaquesDate(year):
if year < 1583:
m, n = 16, 6
else:
m, n = 24, 5
a, b, c = year % 19, year % 4, year % 7
d = (19 * a + m) % 30
e = (2 * b + 4 * c + 6 * d + n) % 7
if d + e < 10:
return datetime.date(year, 3, d + e + 22)
else:
return datetime.date(year, 4, d + e - 9)