From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp11.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms5.migadu.com with LMTPS id cGiULm5q22NWZgEAbAwnHQ (envelope-from ) for ; Thu, 02 Feb 2023 08:46:54 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp11.migadu.com with LMTPS id +N+tLm5q22NFMwAA9RJhRA (envelope-from ) for ; Thu, 02 Feb 2023 08:46:54 +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 4EB503E938 for ; Thu, 2 Feb 2023 08:46:54 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pNUIF-00087K-07; Thu, 02 Feb 2023 02:46:03 -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 1pNUIA-00086m-CU for emacs-orgmode@gnu.org; Thu, 02 Feb 2023 02:45:59 -0500 Received: from mout.gmx.net ([212.227.15.19]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pNUI7-0003Sk-1p for emacs-orgmode@gnu.org; Thu, 02 Feb 2023 02:45:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.at; s=s31663417; t=1675323952; bh=f0J6QuG5GqrS62e6Vfa1OG+lVaYUN2leRGpehSEg6IQ=; h=X-UI-Sender-Class:Subject:To:References:From:Date:In-Reply-To; b=OIWghXRHzdZfrBEQxPJPF+WMBPbhZ4PJD00wRPVNjAI9dMsSYM4vIM1VofFkvpgs1 loJXaE1x1ISJHGrvXBSA6iQi1TWWIt8IGX7/iERVwm9Wr5KEuxKSQCxhq1+uFORMlM aLGHlu/NoA1M2uEJTJs1Z1+jvdGtwC4hNk83AnZnuKaO47LwCatrZC+JlZgd/ajJ0C HMjO4OZlwi0Viy5N8n+BhU9GTnQSqkWFzDIRppGcm9EJGyaeI/49Ij7cTpCX6raFTQ 2+LIppJ0EkBFo6c1uszRaAP3ED5nCsSLu7EFFtq0Eu8idzHnpaPXuSNRGRFFC0B2XL scXodVN5ziGdA== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from [192.168.2.102] ([80.121.69.21]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MJE2D-1p2mm429kJ-00Keq1; Thu, 02 Feb 2023 08:45:52 +0100 Subject: Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO To: Max Nikulin , emacs-orgmode@gnu.org References: <63ca1283.170a0220.5bc81.0fdd@mx.google.com> <87pmb9k8oi.fsf@tsdye.online> <3035CDD5-41DD-4516-9E4E-9E0DF16BE2E0@gmail.com> <87lelo8c9r.fsf@localhost> <2150768.1675077958@archlinux> <87tu063ox2.fsf@localhost> <87r0v9sio1.fsf@christianmoe.com> <87edr9lgq6.fsf@localhost> <87o7qdsf7h.fsf@christianmoe.com> <87v8kljz3n.fsf@localhost> <5dbbab8f-bec8-9272-2a07-b8e484b93c85@gmx.at> <42cb4a53-c293-5a25-c445-3c912bb028fb@gmail.com> From: Heinz Tuechler Message-ID: <4966220d-6c4d-c144-1837-c415868de8bc@gmx.at> Date: Thu, 2 Feb 2023 08:45:51 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <42cb4a53-c293-5a25-c445-3c912bb028fb@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:ww0uAKHLPqFElFCSNH1/E9thaRhE9bDoSuqFFnapk8kNMnjSU6P E1mu+rIFh9tdieHQoS/fxRvTEEK1A8Y6IiNL/xiDbFpkJFSZ5ET96wPYGdxAz9MmyFIuhSO MLXHVH+CZc4gHycL0mKoPnCq8Az1CQGOU+qTghsTdfHkqQzoROy13hQnaMGIvVITJFuZ+NY ECuQIP1XpNNHKh34egwRA== UI-OutboundReport: notjunk:1;M01:P0:WcQbEa1LayE=;01gxtKRQViSqVptoc6tCkpjW7Hr qm1UbM/SXQXyIkjYX+/P+2zRIf+5FJC2haVFIspFouZVmf7budqbW+XE5H2QJgnoYeDV8NnFr GslwmBGU/3Un1lhykJ0hSG2OtgcX9JIOX45Yybsjs/wvm70jMThUP7tlaRAQsTDNswPPxhmp9 3lDEHFunIdCHhlg7TC25N+RgQK+rmb/gS6PHuVa4KQMg3Zp36QLDs+sKqbJjOp4MdoIwbV/++ ZIdHwlqplKe2V2gsRoQ+W/gZsswdd4fYj6QWyRiW97bD7HmEUreOo3YjLAroMUyqSAHzcb5gn lpkTXLCSZuI/UmkSvXaaYP5TpWVsq4FGdLsbgijnV7gmxB/VKp/2v4xxZ4GF5RUJIqfWqnw8e xF3PLgfAT1tDva26hEzj+7sneiE594HNhn/daqv6y5uySwRL8MaBbHB/c4Rz13+MdOGBfOSJs JOnE/0Rf0HmnKi0z3CMRJR28LHN98DrNx+0jMSisHFQczpMuo3dIJUZ0HzWXhUph2npqoNsHd c/K0I02f9zyZjk2M4vPLOss51LmpTabpZw9mlxbUHih/eE5M5lPgsNJB9nVLEwK083zDM3PKa YoTvI62IJeaHkwW5rfQjO20S0iPxeS7ZBmYcxU/dg0BT+4YTQsdmlzoeFSoU25V3y7ZUHkyYJ dhH4IMbv6Hf3DNuRKjk7E+Gf1Av0FbxQXHvo+UkDmXOT3y4HtVuIdRUE8ocG8cDC3h+4xeIsF E9mU5vEMMsav8EWQ+oU3sA87EtqvHGc4ZkWaL92rP1luozlQWzCeODj8QN3UtKWRrPZXlRgUC nnVJXyq/fvCVzc7Vi2kCW8cJX01xzgeLCjh1bzb820ELOMBJgE+KKDjQRdLOUA848XDa1Q5Yg UDwHsVB4R/MXIQ1yU4AVgv04miZR/CrEauJNtYNTbVrlmTHIkGj8dbmk8SdyBJmYIE/Bimkm6 f6QfXolLrRbD81GElCY0X2nQ6KE= Received-SPF: pass client-ip=212.227.15.19; envelope-from=tuechler@gmx.at; helo=mout.gmx.net X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.09, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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=1675324014; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to: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:dkim-signature; bh=9Ac7fCy6r/A7c1XHjjnjEM7g2ThQOgAFYKldnhTWAPE=; b=NT+4dA+OTVB8vaOoO8ojBhH8UpCAGwsAooc6GvuoThLwAEuHxOXbewc8VlkWs2SBYgQUOl qVedfUs9mxgnj3prmwEqDO8iq99mJjd0vLJpHMNPZwlAE+uhzHyG6bSTv0P4LAGFQZ+DXO iRWLIku2sfkoy40BKoCFk/rR7+6n9ohAB2BafKOUM4AB0Unl/DqE64UKSZEgJwO6udGTVh +9HxmzPzro2gb9FNnUCGu7A2Zt18ivINeAUIfPALCvjwBqk+pzI9OgJYIbO6UKvTMk5ZMk FbH/Hg2LxKDe6wbg3HtDF7mQhhnH/TL/d6vaNPH7fv/EsNhSkevlv9YrmQmFjQ== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=gmx.at header.s=s31663417 header.b=OIWghXRH; 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=pass (policy=none) header.from=gmx.at ARC-Seal: i=1; s=key1; d=yhetil.org; t=1675324014; a=rsa-sha256; cv=none; b=O39F3SnQPODX18ttx+USTQ9uT+YDIsAYvM7EV7jh590Y2UHK0C9bxNYiiUjHNKSJpWnT9U qNfMJ+sJWR43q51KxvZzvxEMQa7SA37Wqvd8e98eSgnHz8tOS9JBsczK7iUIcPQKRBAslW 3Vr0KAFcSGXynzFoanmMRRoEXz4d8jjvaTKp+NK+L5ts/Z7ZgE20pMMOI/oFvI6mUCglGU SpH9Gey+Lx/SmYR+B5XFydDWVxwkvyOVibuLL8ndo0BzSxue8KF2yCpoI44sh9C/DqL0NC 7EqX0NNQPFOjloEHoRvytJsrG8Gj6xk0JuajpA90B2KlaoAUtjRXEqxOl8N2CQ== Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=gmx.at header.s=s31663417 header.b=OIWghXRH; 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=pass (policy=none) header.from=gmx.at X-Migadu-Scanner: scn0.migadu.com X-Spam-Score: -9.51 X-Migadu-Queue-Id: 4EB503E938 X-Migadu-Spam-Score: -9.51 X-TUID: 4p36QD9Hz4c7 Max Nikulin wrote/hat geschrieben on/am 02.02.2023 04:22: > On 02/02/2023 04:57, Heinz Tuechler wrote: >> My impression is that many of non experts like me don't >> know in which time zone they are living. > > For you own time zone: Open Development tools in a browser ([F12]), > switch to console, type > > new Intl.DateTimeFormat().resolvedOptions().timeZone > Thank you, Max. It seems to me that this shows the time zone I selected at set up of the computer, in my case Europe/Berlin. Using package lutz in R with correct coordinates I see Europe/Vienna, based on open street map. Days ago I did not even know that Berlin and Vienna are in different time zones. > I am sure there are a lot of web pages that do the same. > > On linux you can use the following tool > > timedatectl > > Unfortunately Emacs does not have API to obtain time zone identifier, > only offset and abbreviation are exposed by GNU libc. POSIX does not > have such requirement. > >> Is it trivial to find the [continent/city] timezone name to a specific >> place? > > For other places: since data to build time zone map are available, there > should be web sites that allows to find identifier for any location. > Sorry, I do not use them, so I can not recommend a particular one. > > An application that is able to read locally installed tzdata may assist > by filtering the list by time offset or by the continent (or the ocean, > see e.g. Pacific/Apia trips across the International date line to > America and back to Asia with Australia). >