Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753802AbZAEAVW (ORCPT ); Sun, 4 Jan 2009 19:21:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751496AbZAEAVK (ORCPT ); Sun, 4 Jan 2009 19:21:10 -0500 Received: from wf-out-1314.google.com ([209.85.200.175]:16894 "EHLO wf-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750964AbZAEAVJ (ORCPT ); Sun, 4 Jan 2009 19:21:09 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=sy/FPizomo6mqKpYk8rHzsz1mcsbjfZcoOwkxcbhe69Hg7RPq+QJFQaOAqanMscNX2 RM5uQ4+zrjuNDIVItH4xN857h3i0jJSLwGMOapk37uKII6gPzUGSdnfsnuRSGg4ay8k+ zfTwlPP2PaYUc1c+X8PEEpHiy8Um7H0VkiPYU= Message-ID: <8752a8760901041621o51380e91x9ef8414b22c40ffc@mail.gmail.com> Date: Mon, 5 Jan 2009 00:21:06 +0000 From: "Ben Goodger" To: "David Newall" Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009 Cc: david@lang.hm, "Kyle Moffett" , "Robert Hancock" , linux-kernel@vger.kernel.org, linasvepstas@gmail.com, "Jeffrey J. Kosowsky" , MentalMooMan , "Travis Crump" , burdell@iruntheinter.net In-Reply-To: <496150DF.2070501@davidnewall.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <3ae3aa420901021125n1153053fsdf2378e7d11abbc0@mail.gmail.com> <496076A9.7030907@davidnewall.com> <4960897D.5030603@davidnewall.com> <4961432A.80509@davidnewall.com> <49614835.7000505@davidnewall.com> <496150DF.2070501@davidnewall.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1297 Lines: 32 2009/1/5 David Newall : >> another poster said that NTP packets include information about this >> month's leap second, so that implies that they could change monthly. > > Not "could change monthly" rather, "could change at any month". > > The frequency of zoneinfo updates would therefore be: every time the > zones you care about change; and every time there's a leap second. No > big effort. Unfortunately, as has been pointed out, timezones are completely unrelated to leap seconds. NB. Leap seconds, positive or negative, potentially occur every six months (June 30 or Dec 31), but since their introduction this frequency has happened only once (in 1972); historically they have been inserted on average every 1.5 years, but there have been only two since 2000. -- Benjamin Goodger -----BEGIN GEEK CODE BLOCK----- Version: 3.1 GCS/S/M/B d- s++:-- a18 c++$ UL>+++ P--- L++>+++ E- W+++$ N--- K? w--- O? M- V? PS+(++) PE-() Y+ PGP+ t 5? X-- R- !tv() b+++>++++ DI+++ D+ G e>++++ h! !r*(-) y ------END GEEK CODE BLOCK------ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/