120 lines
3.5 KiB
Python
120 lines
3.5 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 intl import gettext as _
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#-------------------------------------------------------------------------
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#
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# Julian
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#
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#-------------------------------------------------------------------------
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class Julian(Calendar.Calendar):
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"""Julian calendar"""
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SDN_OFFSET = 32083
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DAYS_PER_5_MONTHS = 153
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DAYS_PER_4_YEARS = 1461
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NAME = "Julian"
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TNAME = _("Julian")
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def quote_display(self,year,month,day,mode):
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return "%s (%s)" % (self.display(year,month,day,mode),Julian.NAME)
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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 Julian date"""
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if sdn <= 0 :
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return (0,0,0)
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temp = (sdn + Julian.SDN_OFFSET) * 4 - 1
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# Calculate the year and day of year (1 <= dayOfYear <= 366)
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year = temp / Julian.DAYS_PER_4_YEARS
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dayOfYear = (temp % Julian.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 / Julian.DAYS_PER_5_MONTHS;
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day = (temp % Julian.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 Julian calendar date to an SDN number"""
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# check for invalid dates
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if iyear==0 or iyear<-4713 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 (Jan 2, 4713 B.C.)
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if iyear == -4713:
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if imonth == 1 and iday == 1:
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return 0
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# Make year always a positive number
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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*Julian.DAYS_PER_4_YEARS)/4 + \
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(month*Julian.DAYS_PER_5_MONTHS+2)/5 + \
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iday - Julian.SDN_OFFSET
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Calendar.register(Julian)
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