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Class for accessing `tzres.dll`, which contains timezone name related
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Load a timezone name from a DLL offset (integer).
>>> from dateutil.tzwin import tzres
>>> tzr = tzres()
>>> print(tzr.load_name(112))
'Eastern Standard Time'
:param offset:
A positive integer value referring to a string from the tzres dll.
..note:
Offsets found in the registry are generally of the form
`@tzres.dll,-114`. The offset in this case if 114, not -114.
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Parse strings as returned from the Windows registry into the time zone
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>>> tzr = tzres()
>>> print(tzr.name_from_string('@tzres.dll,-251'))
'Dateline Daylight Time'
>>> print(tzr.name_from_string('Eastern Standard Time'))
'Eastern Standard Time'
:param tzname_str:
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For a given year, get the DST on and off transition times, expressed
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The year whose transitions you would like to query.
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Returns a :class:`tuple` of :class:`datetime.datetime` objects,
``(dston, dstoff)`` for zones with an annual DST transition, or
``None`` for fixed offset zones.
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