65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
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# -*- coding: utf-8 -*-
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# This file is part of convertdate.
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# http:#github.com/fitnr/convertdate
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# Licensed under the MIT license:
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# http:#opensource.org/licenses/MIT
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# Copyright (c) 2017, fitnr <fitnr@fakeisthenewreal>
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from .utils import floor, jwday, monthcalendarhelper
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from . import gregorian
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EPOCH = 1825029.5
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MONTH_NAMES = ["Thout", "Paopi", "Hathor", "Koiak", "Tobi", "Meshir",
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"Paremhat", "Paremoude", "Pashons", "Paoni", "Epip", "Mesori", "Pi Kogi Enavot"]
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DAY_NAMES = ["Tkyriaka", "Pesnau", "Pshoment", "Peftoou", "Ptiou", "Psoou", "Psabbaton"]
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def is_leap(year):
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"Determine whether this is a leap year."
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return year % 4 == 3 or year % 4 == -1
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def to_jd(year, month, day):
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"Retrieve the Julian date equivalent for this date"
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return day + (month - 1) * 30 + (year - 1) * 365 + floor(year / 4) + EPOCH - 1
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def from_jd(jdc):
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"Create a new date from a Julian date."
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cdc = floor(jdc) + 0.5 - EPOCH
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year = floor((cdc - floor((cdc + 366) / 1461)) / 365) + 1
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yday = jdc - to_jd(year, 1, 1)
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month = floor(yday / 30) + 1
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day = yday - (month - 1) * 30 + 1
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return year, month, day
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def to_gregorian(year, month, day):
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return gregorian.from_jd(to_jd(year, month, day))
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def from_gregorian(year, month, day):
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return from_jd(gregorian.to_jd(year, month, day))
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def month_length(year, month):
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if month <= 12:
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return 30
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elif month == 13:
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if is_leap(year):
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return 6
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else:
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return 5
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else:
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raise ValueError("Invalid month")
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def monthcalendar(year, month):
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start_weekday = jwday(to_jd(year, month, 1))
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monthlen = month_length(year, month)
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return monthcalendarhelper(start_weekday, monthlen)
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