ile('/usr/share/zoneinfo/America/New_York')

        >>> print(datetime(2016, 1, 3, tzinfo=NYC))     # EST
        2016-01-03 00:00:00-05:00

        >>> print(datetime(2016, 7, 7, tzinfo=NYC))     # EDT
        2016-07-07 00:00:00-04:00


    The ``tzfile`` structure contains a fully history of the time zone,
    so historical dates will also have the right offsets. For example, before
    the adoption of the UTC standards, New York used local solar  mean time:

    .. doctest:: tzfile

       >>> print(datetime(1901, 4, 12, tzinfo=NYC))    # LMT
       1901-04-12 00:00:00-04:56

    And during World War II, New York was on "Eastern War Time", which was a
    state of permanent daylight saving time:

    .. doctest:: tzfile

        >>> print(datetime(1944, 2, 7, tzinfo=NYC))    # EWT
        1944-02-07 00:00:00-04:00

    Nc