def new_year(cls, gregorian_year):
"""Return the list of ordinal dates of Tibetan New Year in
Gregorian year, 'gregorian_year'."""
dec31 = GregorianDate.year_end(gregorian_year)
t_year = cls.fromordinal(dec31).year
return list_range(
[cls.losar(t_year - 1), cls.losar(t_year)],
GregorianDate.year_range(gregorian_year))
def is_long_year(cls, iso_year):
"""Return True if ISO year 'iso_year' is a long (53-week) year."""
jan1 = weekday_fromordinal(GregorianDate.new_year(iso_year))
dec31 = weekday_fromordinal(GregorianDate.year_end(iso_year))
return jan1 == DayOfWeek.THURSDAY or dec31 == DayOfWeek.THURSDAY
