Great catch; thanks. I've changed the rules as shown below. --ado Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox -10:30 - HST 1933 Apr 30 2:00 #Laws 1933 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Fox+2 -10:30 US H%sT 1947 Jun 8 2:00 #Schmitt&Fox+2 -10:00 - HST -----Original Message----- From: Andy Lipscomb [mailto:AndyLipscomb@decosimo.com] Sent: Wednesday, January 19, 2011 4:22 To: tz@lecserver.nci.nih.gov Subject: RE: proposed time zone package changes + # and indicates that standard time was adopted effective noon, January + # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight + # saving for the period between the last Sunday of each April and the + # last Sunday of each September, but less than a month later repealed the + # act," (page 220), that year-round daylight saving time was in effect + # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for + # when clocks changed) and that clocks were changed by 30 minutes + # effective the second Sunday of June, 1947 (page 219, with no time of + # day given for when clocks changed). A footnote for the 1933 changes + # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) + # and Act 163 (approved 21 May 1933)." ! # Note that 1933-05-21 was a Sunday. ! # We're left to guess the time of day when Act 163 was approved; guess noon. ! ! Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox ! -10:30 - HST 1933 Apr 30 2:00 #Laws 1933 ! -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12 ! -10:30 1:00 HST 1942 Feb 09 2:00 #Schmitt&Cox+2 ! -10:30 - HDT 1945 Sep 30 2:00 #Schmitt&Fox+2 ! -10:30 US H%sT 1947 Jun 8 2:00 #Schmitt&Fox+2 -10:00 - HST Unless I'm misreading, those rules have permanent DST (but with the HST abbreviation) in the 1933-1942 period, and no DST (but with the HDT abbreviation) during WWII, which is reversed from the text. In other words, the third and fourth offsets appear to be switched.