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Tests for L{twisted.python._tzhelper}.
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Call L{mktime_real}, and if it raises L{OverflowError}, catch it and raise
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@param t9: A time as a 9-item tuple.
@type t9: L{tuple}
@return: A timestamp.
@rtype: L{float}
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Set time zone.
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Add cleanup hooks to a test case to reset timezone to original value.
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Tests for L{FixedOffsetTimeZone}.
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Test that timezone attributes respect the timezone as set by the
standard C{TZ} environment variable and L{tzset} API.
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