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    :param stdabbr:
        The abbreviation for standard time (e.g. ``'EST'``).

    :param stdoffset:
        An integer or :class:`datetime.timedelta` object or equivalent
        specifying the base offset from UTC.

        If unspecified, +00:00 is used.

    :param dstabbr:
        The abbreviation for DST / "Summer" time (e.g. ``'EDT'``).

        If specified, with no other DST information, DST is assumed to occur
        and the default behavior or ``dstoffset``, ``start`` and ``end`` is
        used. If unspecified and no other DST information is specified, it
        is assumed that this zone has no DST.

        If this is unspecified and other DST information is *is* specified,
        DST occurs in the zone but the time zone abbreviation is left
        unchanged.

    :param dstoffset:
        A an integer or :class:`datetime.timedelta` object or equivalent
        specifying the UTC offset during DST. If unspecified and any other DST
        information is specified, it is assumed to be the STD offset +1 hour.

    :param start:
        A :class:`relativedelta.relativedelta` object or equivalent specifying
        the time and time of year that daylight savings time starts. To specify,
        for example, that DST starts at 2AM on the 2nd Sunday in March, pass:

            ``relativedelta(hours=2, month=3, day=1, weekday=SU(+2))``

        If unspecified and any other DST information is specified, the default
        value is 2 AM on the first Sunday in April.

    :param end:
        A :class:`relativedelta.relativedelta` object or equivalent representing
        the time and time of year that daylight savings time ends, with the
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        occurs at 2AM in the DST zone and the clocks are set back 1 hour to 1AM,
        set the `hours` parameter to +1.


    **Examples:**

    .. testsetup:: tzrange

        from dateutil.tz import tzrange, tzstr

    .. doctest:: tzrange

        >>> tzstr('EST5EDT') == tzrange("EST", -18000, "EDT")
        True

        >>> from dateutil.relativedelta import *
        >>> range1 = tzrange("EST", -18000, "EDT")
        >>> range2 = tzrange("EST", -18000, "EDT", -14400,
        ...                  relativedelta(hours=+2, month=4, day=1,
        ...                                weekday=SU(+1)),
        ...                  relativedelta(hours=+1, month=10, day=31,
        ...                                weekday=SU(-1)))
        >>> tzstr('EST5EDT') == range1 == range2
        True

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    3 hours *behind* GMT. The ``tzstr`` time zone object will parse this as an
    offset 3 hours *ahead* of GMT. If you would like to maintain the POSIX
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