From owner-cvs-src@FreeBSD.ORG Sat Oct 22 09:48:39 2005 Return-Path: X-Original-To: cvs-src@freebsd.org Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7CD1E16A420; Sat, 22 Oct 2005 09:48:39 +0000 (GMT) (envelope-from phk@critter.freebsd.dk) Received: from phk.freebsd.dk (phk.freebsd.dk [130.225.244.222]) by mx1.FreeBSD.org (Postfix) with ESMTP id F01B243D46; Sat, 22 Oct 2005 09:48:38 +0000 (GMT) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (unknown [192.168.48.2]) by phk.freebsd.dk (Postfix) with ESMTP id 4F1ACBC50; Sat, 22 Oct 2005 09:48:36 +0000 (UTC) To: Bruce Evans From: "Poul-Henning Kamp" In-Reply-To: Your message of "Sat, 22 Oct 2005 19:27:57 +1000." <20051022185422.Q8268@delplex.bde.org> Date: Sat, 22 Oct 2005 11:48:36 +0200 Message-ID: <34506.1129974516@critter.freebsd.dk> Sender: phk@critter.freebsd.dk Cc: cvs-src@freebsd.org, src-committers@freebsd.org, Andre Oppermann , cvs-all@freebsd.org Subject: Re: Timekeeping [Was: Re: cvs commit: src/usr.bin/vmstat vmstat.c src/usr.bin/w w.c] X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Oct 2005 09:48:39 -0000 In message <20051022185422.Q8268@delplex.bde.org>, Bruce Evans writes: >What's a UTC delta? Deltas don't (shouldn't) depend on the calendar. As easy as it would be to stick our head in the sand, ignore international treaties,geophysics and astronomy, point to POSIX and ignore leapseconds, it is not an feasible way out for us as an operating system project. UTC deltas does depend on the calendar for now. There is proposal from USA to make them DTRT pending in ITU-R Working Party 7A, but it is meeting fierce opposition from astronomers and geophysicists who hold the position that we can just ignore computers Until the future of leapseconds are resolved, something that could easily take 25 years, we have to deal with them. So an UTC offect contains any leap seconds we are aware off, and consequently, it depends on the calendar. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.