From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp11.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms5.migadu.com with LMTPS id IM6jBAa+0GP1hQAAbAwnHQ (envelope-from ) for ; Wed, 25 Jan 2023 06:28:38 +0100 Received: from aspmx1.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp11.migadu.com with LMTPS id aDmlBAa+0GNE6AAA9RJhRA (envelope-from ) for ; Wed, 25 Jan 2023 06:28:38 +0100 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id B956339B5E for ; Wed, 25 Jan 2023 06:28:37 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pKYKB-0000ph-2M; Wed, 25 Jan 2023 00:27:55 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pKYK9-0000pO-Jf for emacs-orgmode@gnu.org; Wed, 25 Jan 2023 00:27:53 -0500 Received: from stw1.rcdrun.com ([217.170.207.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pKYK8-0007kl-0B for emacs-orgmode@gnu.org; Wed, 25 Jan 2023 00:27:53 -0500 Received: from localhost ([::ffff:102.81.230.130]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000055D9B.0000000063D0BDD8.00002E47; Tue, 24 Jan 2023 22:27:51 -0700 Date: Tue, 24 Jan 2023 22:18:25 +0300 From: Jean Louis To: Max Nikulin Cc: emacs-orgmode@gnu.org Subject: Re: UTC or not UTC for timestamps in the past ([FEATURE REQUEST] Timezone support in org-mode) Message-ID: Mail-Followup-To: Max Nikulin , emacs-orgmode@gnu.org References: <63cc5983.620a0220.a7d40.68f6@mx.google.com> <87r0vnhxj6.fsf@tsdye.online> <87ilgyiid8.fsf@tsdye.online> <87edrli4sr.fsf@tsdye.online> <871qnkiqwu.fsf@tsdye.online> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.9+54 (af2080d) (2022-11-21) Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DATE_IN_PAST_06_12=1.543, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-orgmode@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "General discussions about Org-mode." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-orgmode-bounces+larch=yhetil.org@gnu.org Sender: emacs-orgmode-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1674624517; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=B2pZDqSQgjhQ9dZE9dSGantP4rwhVlZz/B97zqBp8cw=; b=TAjg+9wNeVPlOsqiux9VQ/aXng6BCNyGAt7NG83K1m6ae1dSVMnT0ZBo0ZDkgCDXHl3qe9 KUYbzAb8x0qfzCoGFivR+zg72rX/ODHl4kfiHRJM7iz5GHZ51HtwCuRT8tkQmdPBOD7kl6 7zUD57sZGGOD0UrJR6uCefUF6JYO+MX81zKCc8f0+Matkhm4lfB0aMuI/WvQdRI95VvjrE OJWRHzEozzBMKEOPsVTiQW7++yfh3FcFLtiA7NJ/GFn+trPF8KC4SZq09ArWaNgZZDvKAb yCGEErih00e2J8s/msaQi2vgFEMboN6OoGNSF7PCwlepllNKq6Ilsrt36pN3IA== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=none; spf=pass (aspmx1.migadu.com: domain of "emacs-orgmode-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="emacs-orgmode-bounces+larch=yhetil.org@gnu.org"; dmarc=none ARC-Seal: i=1; s=key1; d=yhetil.org; t=1674624517; a=rsa-sha256; cv=none; b=gBO7s/3b6a9qTRy/Xvz3OSMZcHLrg3Bfl/nhxBD5ypLb9ePxECXWqdfl6TrmMnhSSd41e8 5/CKfiY5X7iQUa2dtHfKnfZIsINkWE16NBep/+XY171it8wcdMzdbGgRnjaQHX2jMynYyN 2X2vKCTeTYSx6kimN72c+BYz+RR8rsVHlwynLuImbIKkoxTrhQAFER8UfSNX8x8McJglzs QaITWnHaLs+ucJYS0Sp7hc26yI+sUPeAZyeWZ23K3wy44JAjCGAeydAW0qAY4CkAy4thwe YGRndTB+CY3zn7BUth5sWrV8gE/B84HuAOIJeCLeS+rOimPauYYc9O+v0qlsZQ== X-Migadu-Scanner: scn1.migadu.com Authentication-Results: aspmx1.migadu.com; dkim=none; spf=pass (aspmx1.migadu.com: domain of "emacs-orgmode-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="emacs-orgmode-bounces+larch=yhetil.org@gnu.org"; dmarc=none X-Migadu-Spam-Score: -0.87 X-Spam-Score: -0.87 X-Migadu-Queue-Id: B956339B5E X-TUID: U7uTs66GbJ2D * Max Nikulin [2023-01-24 07:51]: > On 24/01/2023 09:44, Thomas S. Dye wrote: > > Max Nikulin writes: > > > > > > I believed that [2023-01-22 Sun 08:29@+1100] unambiguously suggests > > > offset from UTC. > > > > Not for a casual programmer like me. The timestamp alone might easily be > > read as 11 hours ahead of local time. Nevertheless, Org is certainly > > free to interpret it as relative to UTC. > > My primary concern is that I might be wrong assuming that format like > [2023-01-22 Sun 08:29@+1100] with offset in respect to UTC is reciprocal > identity mapping to UTC. ISO 8601 is international standard on which you should make decisions. https://en.wikipedia.org/wiki/ISO_8601#Time_offsets_from_UTC https://en.wikipedia.org/wiki/UTC_offset ,---- | The UTC offset (or time offset) is an amount of time subtracted from | or added to Coordinated Universal Time (UTC) time to specify the local | solar time (which may not be the current civil time, whether it is | standard time or daylight saving time). `---- I hope your concern clarifies itself. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/