From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp12.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms5.migadu.com with LMTPS id sIKrEsAv2GOUdQAAbAwnHQ (envelope-from ) for ; Mon, 30 Jan 2023 21:59:44 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp12.migadu.com with LMTPS id AH2OEsAv2GPeagAAauVa8A (envelope-from ) for ; Mon, 30 Jan 2023 21:59:44 +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 10A9541470 for ; Mon, 30 Jan 2023 21:59:43 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pMbEm-0006CB-N6; Mon, 30 Jan 2023 15:58:48 -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 1pMbEl-0006C3-9R for emacs-orgmode@gnu.org; Mon, 30 Jan 2023 15:58:47 -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 1pMbEj-0004qy-HN for emacs-orgmode@gnu.org; Mon, 30 Jan 2023 15:58:46 -0500 Received: from localhost ([::ffff:197.239.7.66]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000103A05.0000000063D82F68.00007244; Mon, 30 Jan 2023 13:58:15 -0700 Date: Mon, 30 Jan 2023 23:36:14 +0300 From: Jean Louis To: Max Nikulin Cc: emacs-orgmode@gnu.org Subject: Re: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Message-ID: Mail-Followup-To: Max Nikulin , emacs-orgmode@gnu.org References: <87mt6e86sr.fsf@tsdye.online> <63c9d976.620a0220.a7d40.113b@mx.google.com> <87tu0mjb24.fsf@tsdye.online> <63ca1283.170a0220.5bc81.0fdd@mx.google.com> <87pmb9k8oi.fsf@tsdye.online> <3035CDD5-41DD-4516-9E4E-9E0DF16BE2E0@gmail.com> <63d43ec5.630a0220.87fac.44e2@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit 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: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_SBL=0.141, 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-Country: US X-Migadu-Flow: FLOW_IN ARC-Seal: i=1; s=key1; d=yhetil.org; t=1675112384; a=rsa-sha256; cv=none; b=n8ROt+Dl8t85inv8/hp7ukykmLTDBTY7WKRZsAa4Yh9uGvAu4daaFDWzWOGa9hp1qyHfJY a7BDhq0PFYk7BZ+Ghf9CMmBz2eMUwzpdjrAJUsmGry5pSpovUAkHv9Rd8BoNXA2Oq9WlyT D8YIP5VrY6rE/lOCCzPgrx5PDjGpeJsrfC3g5+EAtA2khHE8tPnfYsNOw9/6/QxvS40INh 9Uac7C8VUqVQx0kSjmry2neiorx+YZf4lU1XNC9dKAvIT8Qg3hDMHsW+FDhVrDtwfVlABD ZXgs7rx/LGzRL684sf+x2jhY+o1NEwyCDrLbcDn5q51t0W0EDfbzD1iha0stIw== 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-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1675112384; 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=DfANZGqcqWxR/YcyiuJOaGyTbWXVdEeHA3DKpzOjYhU=; b=dtJj9UDmjnAzFUGq6dzYTePK0txr47Ln3X4CONw8A/8UDpPYZTC05iVaixt7IINpsOz3J6 zoJRhkbnbaSLRSIeoLYveoqFpCj4pf+9BcowgSt0dyqW+mDxtN8bI3gxKBzmkZn2HLRHHy B+PHOSiNP27JZvWqnLGGscAPg8gTEQXVU/SrEDez4wywl0m1D8JbUN8vQ4POI+GFXpdaU7 5sM+SB+IWFYWAYUE/4DFlKmw9n6gehFp5erNz4MSRW9AQoR7SV3nkBxJsRbyQkchLxolX2 MkLjymvRTCqrj2Vslodt/IQiq/NX2ZZThH6/BsIjVyEUqyFW4sd5yjGnSmYPdw== 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-Scanner: scn1.migadu.com X-Migadu-Spam-Score: 1.92 X-Spam-Score: 1.92 X-Migadu-Queue-Id: 10A9541470 X-TUID: 0yZCUA9vi1AJ * Max Nikulin [2023-01-29 09:33]: > On 29/01/2023 11:09, Jean Louis wrote: > > * Tim Cross [2023-01-28 00:15]: > > > > > • Offset (fixed) > > > > > • This captures the idea of "when did it happen for the person who > ------------------------------------^^^^^^^^^^^^^^^^^^^ > Jean, you missed it. It is always pleasure to see how I missed it. I suggest that you define the problem in Org mode for purposes of calculations. That way you can solve issues. > > > > > made the observation" > > > > > • e.g., 2007-02-03T04:00:00.000+01:00 > > > > > > > > Offset is not that fixed, maybe from viewpoint of storage as maybe it > ... > > > I think your misinterpreting the intent here. If you specify a timestamp > > > with offset, it is fixed. > > > > That is what you say. And I am pointing out to international standard > > references. > > You reference and verbose message are hardly relevant. Since something has > already happened, time offset is known. DST can not change it, either it is > effective or not at this moment. > > 2007-02-03T04:00:00.000+01:00 > > can not be unambiguously attributed to an IANA timezone ID, however it > precisely specifies UTC time (time in seconds since epoch, etc.). Yes, and I do not say different. We understand each other in it. > Usually (but not necessary) it means 04:00 local time in a timezone 1 hour > ahead of UTC that moment (you may use it to specify 05:00 in timezone having > +02:00 offset). It is enough for a lot of applications. If you are sure, of course, go ahead, I am not sure that using UTC offset, alone, is good idea for future time calculations. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/