Hi TZers, Sorry if this has been asked before, but I couldn't find any documentation on the rules of what should happen for the following circumstances. Here's the definition for Australia/Brisbane: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule AQ 1971 only - Oct lastSun 2:00s 1:00 D Rule AQ 1972 only - Feb lastSun 2:00s 0 S Rule AQ 1989 1991 - Oct lastSun 2:00s 1:00 D Rule AQ 1990 1992 - Mar Sun>=1 2:00s 0 S Rule Holiday 1992 1993 - Oct lastSun 2:00s 1:00 D Rule Holiday 1993 1994 - Mar Sun>=1 2:00s 0 S Zone Australia/Brisbane 10:12:08 - LMT 1895 10:00 Aus AE%sT 1971 10:00 AQ AE%sT As the zone ends with AQ, and AQ does not have a "max" ending date, what should Australia/Brisbane fall back to after 1992? I thought maybe in this instance perhaps "Aus" as it's the one above it, but "Aus" seem to oddly be specific to both World Wars. I also don't think that it should then fall back to a GMTOFF = "10:12:08". That sounds awkward. Thanks, Alfie -- Alfie John alfie@fastmail.com