util.py 文件源码

def __init__(self, value):
        """
        Initializer value can be:

            - integer_type: absolute days from epoch (1970, 1, 1). Can be negative.
            - datetime.date: built-in date
            - string_type: a string time of the form "yyyy-mm-dd"
        """
        if isinstance(value, six.integer_types):
            self.days_from_epoch = value
        elif isinstance(value, (datetime.date, datetime.datetime)):
            self._from_timetuple(value.timetuple())
        elif isinstance(value, six.string_types):
            self._from_datestring(value)
        else:
            raise TypeError('Date arguments must be a whole number, datetime.date, or string')