class Date(object):
    """docstring for Date"""
    def __init__(self, *args):
        if len(args) == 3:
            self.year = str(args[0])
            self.month = str(args[1])
            self.day = str(args[2]).zfill(2)
        if len(args) == 1:
            self.year = str(args[0])[:4]
            self.month = str(args[0])[4:6]
            self.day = str(args[0])[6:]

    def __str__(self):
        return "{0}{1}{2}".format(self.year, self.month, self.day)

    def _get_year(self):
        return self.year

    def _get_month(self):
        return self.month

    def _get_day(self):
        return self.day

    def _set_year(self, year):
        self.year = year

    def _set_month(self, month):
        self.month = month

    def _set_day(self, day):
        self.day = day
	
    def substract_day(self, numDay):
        import datetime
        computed_date = datetime.date(int(self.year), int(self.month), int(self.day)) - datetime.timedelta(numDay)
        comp_year = str(computed_date.year)
        comp_month = str(computed_date.month).zfill(2)
        comp_day = str(computed_date.day).zfill(2)
        return comp_year + comp_month + comp_day