Extract the timezone data from the value #datetimezone(2011, 12, 31, 9, 15, 36, -7, 0). To do this in Power Query, use the function MDateTimeZone.RemoveZone(#datetimezone(2011, 12, 31, 9, 15, 36, -7, 0)). The result will be #datetime(2011, 12, 31, 9, 15, 36).