@property<EOL><INDENT>def start_datetime(self):<DEDENT>
return self.__start_datetime<EOL>
:return: Start time of the time range.
:rtype: datetime.datetime

: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.start_datetime
:Output:
    .. parsed-literal::

        datetime.datetime(2015, 3, 22, 10, 0, tzinfo=tzoffset(None, 32400))