@property<EOL><INDENT>def timedelta(self):<DEDENT>
return self.end_datetime - self.start_datetime<EOL>
:return:
    (|attr_end_datetime| - |attr_start_datetime|) as |timedelta|
:rtype: datetime.timedelta

:Sample Code:
    .. code:: python

        from datetimerange import DateTimeRange
        time_range = DateTimeRange("2015-03-22T10:00:00+0900", "2015-03-22T10:10:00+0900")
        time_range.timedelta
:Output:
    .. parsed-literal::

        datetime.timedelta(0, 600)