133 lines
4.0 KiB
Python
133 lines
4.0 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2001 Donald N. Allingham
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Gregorian calendar module for GRAMPS.
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The original algorithms for this module came from Scott E. Lee's
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C implementation. The original C source can be found at Scott's
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web site at http://www.scottlee.com
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"""
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__author__ = "Donald N. Allingham"
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__version__ = "$Revision$"
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#-------------------------------------------------------------------------
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#
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# Gramps Modules
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#
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#-------------------------------------------------------------------------
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import Calendar
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from gettext import gettext as _
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#-------------------------------------------------------------------------
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#
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# Gregorian
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#
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#-------------------------------------------------------------------------
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class Gregorian(Calendar.Calendar):
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"""Gregorian Calendar"""
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SDN_OFFSET = 32045
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DAYS_PER_5_MONTHS = 153
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DAYS_PER_4_YEARS = 1461
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DAYS_PER_400_YEARS = 146097
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NAME = "Gregorian"
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TNAME = _("Gregorian")
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def quote_display(self,year,month,day,mode):
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return self.display(year,month,day,mode)
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def mlen(self):
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return 3
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def get_ymd(self,sdn):
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"""Converts an SDN number to a gregorial date"""
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if sdn <= 0:
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return (0,0,0)
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temp = (Gregorian.SDN_OFFSET + sdn) * 4 - 1
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# Calculate the century (year/100)
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century = temp / Gregorian.DAYS_PER_400_YEARS
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# Calculate the year and day of year (1 <= dayOfYear <= 366)
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temp = ((temp % Gregorian.DAYS_PER_400_YEARS) / 4) * 4 + 3
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year = (century * 100) + (temp / Gregorian.DAYS_PER_4_YEARS)
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dayOfYear = (temp % Gregorian.DAYS_PER_4_YEARS) / 4 + 1
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# Calculate the month and day of month
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temp = dayOfYear * 5 - 3
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month = temp / Gregorian.DAYS_PER_5_MONTHS
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day = (temp % Gregorian.DAYS_PER_5_MONTHS) / 5 + 1
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# Convert to the normal beginning of the year
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if month < 10 :
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month = month + 3
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else:
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year = year + 1
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month = month - 9
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# Adjust to the B.C./A.D. type numbering
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year = year - 4800
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if year <= 0:
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year = year - 1
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return (year,month,day)
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def get_sdn(self,iyear,imonth,iday):
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"""Converts a gregorian date to an SDN number"""
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# check for invalid dates
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if iyear==0 or iyear<-4714 or imonth<=0 or imonth>12 or iday<=0 or iday>31:
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return 0
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# check for dates before SDN 1 (Nov 25, 4714 B.C.)
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if iyear == -4714:
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if imonth < 11 or imonth == 11 and iday < 25:
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return 0
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if iyear < 0:
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year = iyear + 4801
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else:
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year = iyear + 4800
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# Adjust the start of the year
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if imonth > 2:
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month = imonth - 3
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else:
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month = imonth + 9
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year = year - 1
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return( ((year / 100) * Gregorian.DAYS_PER_400_YEARS) / 4
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+ ((year % 100) * Gregorian.DAYS_PER_4_YEARS) / 4
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+ (month * Gregorian.DAYS_PER_5_MONTHS + 2) / 5
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+ iday
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- Gregorian.SDN_OFFSET );
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def check(self,year,month,day):
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if year > 2100 or month > 12 or day > 31:
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return 0
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return 1
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Calendar.register(Gregorian)
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