From owner-freebsd-stable Mon Apr 8 6:24:44 2002 Delivered-To: freebsd-stable@freebsd.org Received: from spitfire.ecc.engr.uky.edu (spitfire.ecc.engr.uky.edu [128.163.144.21]) by hub.freebsd.org (Postfix) with ESMTP id 7F87737B419 for ; Mon, 8 Apr 2002 06:24:38 -0700 (PDT) Received: from foxbat.ecc.engr.uky.edu ([128.163.144.87] helo=engr.uky.edu) by spitfire.ecc.engr.uky.edu with esmtp (Exim 3.35 #2) id 16uZ8P-000JLr-00 for stable@FreeBSD.ORG; Mon, 08 Apr 2002 09:24:37 -0400 Message-ID: <3CB19A16.1020506@engr.uky.edu> Date: Mon, 08 Apr 2002 09:24:38 -0400 From: Jason Stephenson User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:0.9.9) Gecko/20020402 X-Accept-Language: en-us, en MIME-Version: 1.0 Followup-To: questions@FreeBSD.ORG To: stable@FreeBSD.ORG Subject: Re: DST vs. Cron = Burp References: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG To quote the man page (crontab (5)): BUGS If you're in one of the 70-odd countries that observe Daylight Savings Time, jobs scheduled during the rollback or advance will be affected. In general, it's not a good idea to schedule jobs during this period. For US timezones (except parts of IN, AZ, and HI) the time shift occurs at 2AM local time. For others, the output of the zdump(8) program's verbose (-v) option can be used to determine the moment of time shift. I make it a rule to never schedule daily or Sunday jobs between 1:00 and 3:00 AM (when DST and ST changes go into effect in my area). Jobs scheduled between 2:00 and 3:00 AM will not run during the DST advance, and jobs scheduled between 1:00 and 2:00 AM may run twice during the ST rollback. If you know your job will never run on a Sunday in late March, early April, or October, then you should be all right scheduling it between 1:00 and 3:00 AM. NOTE that I have set follow ups to Questions. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message