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')
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