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# holidays
# --------
# A fast, efficient Python library for generating country, province and state
# specific sets of holidays on the fly. It aims to make determining whether a
# specific date is a holiday as fast and flexible as possible.
#
# Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
# dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
# ryanss <ryanssdev@icloud.com> (c) 2014-2017
# Website: https://github.com/vacanza/holidays
# License: MIT (see LICENSE file)
from datetime import date
from holidays.calendars.gregorian import _timedelta
class _Mandaean:
"""
Mandaean calendar for 1901-2100 years.
https://en.wikipedia.org/wiki/Mandaean_calendar
"""
# Begin of 445271 Mandaean year.
START_DATE = date(1901, 8, 16)
START_YEAR = 1901
END_YEAR = 2100
def new_year_date(self, year: int) -> date | None:
"""
Return Gregorian date of Mandaean new year (1 Dowla) in a given Gregorian year.
"""
if year < _Mandaean.START_YEAR or year > _Mandaean.END_YEAR:
return None
return _timedelta(_Mandaean.START_DATE, 365 * (year - _Mandaean.START_YEAR))
def mandaean_to_gregorian(self, year: int, month: int, day: int) -> date | None:
"""
Return Gregorian date of Mandaean day and month of the year that begins in a given
Gregorian year.
Extra 5 days inserted after 8th month are considered as 13th month.
"""
start_date = self.new_year_date(year)
if not start_date:
return None
if not (1 <= month <= 13) or not (1 <= day <= 30) or (month == 13 and not (1 <= day <= 5)):
return None
if month < 9:
delta = 30 * (month - 1)
elif month == 13:
delta = 30 * 8
else:
delta = 30 * (month - 1) + 5
return _timedelta(start_date, delta + day - 1)
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