And yet another question also related to the war years: [...] Rule US 1942 only - Feb 9 2:00 1:00 W # War Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace [...] Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 -7:00 US M%sT 1944 Jan 1 00:01 -7:00 - MST 1944 Apr 1 00:01 -7:00 US M%sT 1944 Oct 1 00:01 [...] When Phoenix reverted from not observing any DST rules for the interval Jan to Apr 1944 to observing US rules after Apr 1st 1944, does that mean that the DST offset in effect in US (1 hour) introduced in Feb 1942 comes into effect once again for Phoenix? I.e., did Arizona/Phoenix observe: ... 1944 Apr 1st 00:00:58 MST 1944 Apr 1st 00:00:59 MST 1944 Apr 1st 01:01:00 MWT (War time) 1944 Apr 1st 01:01:01 MWT 1944 Apr 1st 01:01:02 MWT ... ? Could you please confirm that my interpretation is correct? Thanks, Liviu