Legally, the "seventh zone" of the Uniform Time Act is called the Hawaii-Aleutian zone, so the "A" should be included. However, outside Alaska (where Adak is located), it is commonly referred to (example, the Hawai`i tourism site http://www.gohawaii.com/oahu/learn/introduction) without the word Aleutian, and the abbreviation would logically reflect that. J Andrew Lipscomb, CPA*ABV, ASA Decosimo Corporate Finance 900 Tallan Building 2 Union Square Chattanooga, TN 37402 423.756.7100 Fax 423.266.6671 www.dcf.decosimo.com -----Original Message----- From: billseymour@gmail.com [mailto:billseymour@gmail.com] On Behalf Of Bill Seymour Sent: Fri 2 November 2007 12:54 To: tz@lecserver.nci.nih.gov Subject: HST vs. HAST A newbie question that could have an answer similar to the recent question about Australian time zones... I note that Pacific/Honolulu and Pacific/Johnston say HST rather than HAST; but America/Adak says HA%sT. Is there a reason for leaving out the 'A' for Hawaii and Johnston Atoll? Thanks, --Bill Seymour