To anyone who can help: The data source file 'australasia' specifies that the Australia/Darwin zone uses the rule Aus from 1-May-1899 onwards. But the Aus rule is undefined for from 1945 onwards! I have copied the salient fragment of the australasia file to the bottom of this message. Am I missing something here? or is the data inconsistent? Moreover, as a general rule, how should one interpret the application of a tz "rule" for periods when the rule is not explicitly defined? Thanks in advance, if anyone can advise. Faithfully, Sean B. Durkin Fragment from 'australasia' =========================== # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Aus 1917 only - Jan 1 0:01 1:00 - Rule Aus 1917 only - Mar 25 2:00 0 - Rule Aus 1942 only - Jan 1 2:00 1:00 - Rule Aus 1942 only - Mar 29 2:00 0 - Rule Aus 1942 only - Sep 27 2:00 1:00 - Rule Aus 1943 1944 - Mar lastSun 2:00 0 - Rule Aus 1943 only - Oct 3 2:00 1:00 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Northern Territory Zone Australia/Darwin 8:43:20 - LMT 1895 Feb 9:00 - CST 1899 May 9:30 Aus CST