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[5.44.169.188]) by smtp.googlemail.com with ESMTPSA id o16-20020a656150000000b004db367c10b0sm11263403pgv.46.2023.02.01.19.22.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Feb 2023 19:22:43 -0800 (PST) Message-ID: <42cb4a53-c293-5a25-c445-3c912bb028fb@gmail.com> Date: Thu, 2 Feb 2023 10:22:40 +0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Subject: Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [POLL] Proposed syntax for timestamps with time zone info Content-Language: en-US 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> From: Max Nikulin To: emacs-orgmode@gnu.org Cc: Heinz Tuechler In-Reply-To: <5dbbab8f-bec8-9272-2a07-b8e484b93c85@gmx.at> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1029; envelope-from=manikulin@gmail.com; helo=mail-pj1-x1029.google.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 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_NONE=-0.0001, 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=1675308221; 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:dkim-signature; bh=/VtOf3vUBraqzi7XDIwk/WHMNr9Z17PKsiqQaXHy5+o=; b=j7/sqlX2mz2wtSX11GKueMd91ipNleGkYsGyB9W+/NxDh27SCmtpNentjZZCPG/AOJ64tX /PJDUyjkDAHn4B/gNguqlbticdw/qigZiVb3fV9qvvp+VDhKetm47ZPTUIUL9hmNcJQ5NF UorTnEXe6FwU35NRt2G+UobJkANvvvK0YH1OvMc3+iQkbDztFegSJBCMDNFFYuB4lXSdaA /C74Ozz96H0NlFXvc4JTVvLAM0OCaMYaE/Muwb+qKgzIUuq6vMv4iOHiI3InFy7yZdZdxP /LqxcWzZra/wIpZISycOFmWE5TOLZSv8rClhfL0SRboclB3G5teTNl8Yecz52Q== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b=O48yLhkO; 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=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none) ARC-Seal: i=1; s=key1; d=yhetil.org; t=1675308221; a=rsa-sha256; cv=none; b=MjSDYRbHKhQwA2F/RbWxaK7Vcamlxq3FcBRUeOYAYoEIFVkZyyLGr96KO4je7CO0VCjLyx 8R4K0xHmL057/Nrd+9kx0wLroz1cwLI2Vb5LZRtx4mZ+Iv4dZIL5pUZrD0OyykslQsWxfu cNkjPsYdSpkSFefgWgK4ezGk30BPs+aroWMNZoYM4kpOLO7deaJrWNIhHgf6Cn8OcI9Urj /Zxid5RNJw6MlQcmAw7fzAG21koIpvw5pxrH4hGby8WTbl7/stzjISmzLzkocsAFFEyadh zL8LWl3Vkmd2wwe5njd/gmT+AZ/xi/ozaiwAn0bA7zyjqQM4wMMJCUZK1dddCQ== Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b=O48yLhkO; 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=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none) X-Migadu-Scanner: scn0.migadu.com X-Spam-Score: -1.08 X-Migadu-Queue-Id: 052113DAD5 X-Migadu-Spam-Score: -1.08 X-TUID: uSkrUEIf7rJS 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 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).