'Helper method to determine the days in the individual months
of the BS calendar, as well as the start of the year'

@classmethod
def _get_calendar_data(cls, year):

    default = [17, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30]
    return cls.NEPALI_CALENDAR_DATA.get(year, default)
