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        >>> ploc_dt1 = pacific.localize(dt, is_dst=True)
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        >>> ploc_dt1.strftime(fmt)
        '2008-03-09 02:00:00 PDT (-0700)'
        >>> ploc_dt2.strftime(fmt)
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        >>> str(ploc_dt2 - ploc_dt1)
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        '-1 day, 20:30:00'

        >>> str(tz.utcoffset(ambiguous, is_dst=True))
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        '1:00:00'
        >>> str(tz.dst(normal, is_dst=True))
        '1:00:00'

        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> str(tz.dst(ambiguous, is_dst=False))
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        >>> str(tz.dst(ambiguous, is_dst=True))
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        >>> tz.tzname(normal)
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        >>> tz.tzname(normal, is_dst=False)
        'NDT'
        >>> tz.tzname(normal, is_dst=True)
        'NDT'

        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> tz.tzname(ambiguous, is_dst=False)
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        >>> tz.tzname(ambiguous, is_dst=True)
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