From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp10.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 qHKxJFOLw2ONegEAbAwnHQ (envelope-from ) for ; Sun, 15 Jan 2023 06:12:51 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp10.migadu.com with LMTPS id iF7XI1OLw2P24wAAG6o9tA (envelope-from ) for ; Sun, 15 Jan 2023 06:12:51 +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 6298C6FAB for ; Sun, 15 Jan 2023 06:12:51 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pGvJg-0005VO-Iv; Sun, 15 Jan 2023 00:12:24 -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 1pGvJb-0005V7-DO for emacs-orgmode@gnu.org; Sun, 15 Jan 2023 00:12:19 -0500 Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pGvJZ-00023O-H7 for emacs-orgmode@gnu.org; Sun, 15 Jan 2023 00:12:19 -0500 Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pGvJL-0001Zn-ME for emacs-orgmode@gnu.org; Sun, 15 Jan 2023 06:12:03 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: emacs-orgmode@gnu.org From: Max Nikulin Subject: Re: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Date: Sun, 15 Jan 2023 12:11:44 +0700 Message-ID: References: <86zgamtv6o.fsf@gmail.com> <87tu0t1i0c.fsf@localhost> <87k01p1gvx.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Content-Language: en-US In-Reply-To: <87k01p1gvx.fsf@localhost> Received-SPF: pass client-ip=116.202.254.214; envelope-from=geo-emacs-orgmode@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: 26 X-Spam_score: 2.6 X-Spam_bar: ++ X-Spam_report: (2.6 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FORGED_MUA_MOZILLA=2.309, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NICE_REPLY_A=-0.001, NML_ADSP_CUSTOM_MED=0.9, SPF_HELO_NONE=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=1673759571; a=rsa-sha256; cv=none; b=skN6nZMAiBf7TSr5m8xSu+m1ii4CsbQBVNIaG55mOWvn+TAvhJDjFPcr16ig9QIWSLIZNE 4hSJn9tbqsTFWPVKSDsX3Ft2Wm0HE27dE3AE8on5IC4F/WebU5RSFDf4zjKgBj+r93phsQ vocFVyMswgnqCJfJb0WfRqzP4lMBPv8DoC2JWXXScFZHh5vkhJhmvQzTM6Qf13CtnBm7c6 KEIb+JtDXEg/E66pS9QQ3kFsPKSN65qYX12HYufv7qUyXf7O52/sVJxs5Sfr/wsdRy4zV4 tZ1h0ZAZXXWZp6ZZJx99LaRli7nnAKay+wi+hKyCAOQZ1vkf/jcor9VTWedpYw== 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=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=gmail.com (policy=none) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1673759571; 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; bh=L7CjiGxFTAOlN+VxmJbqq/fqCY9bHA9jefaGuTnmQTo=; b=ACwKESJ9zPvn/hDy1IDZJerS/vglSNVH79rAADR/ZLrqbJp+hLERrNd/bXTdxprGB1Pfos PQ+PlsOgpnq2UCG574NXy1qtzKGfmPeURxZ5Co47caGkbYvPkoHWrB04UbGKFhghBZ88jC YDj/jwX67bhPWGRSj3/yRBD5VIIEZpuoKdDgMDMoOuLq1O/GG8vsYVRaZzsxTWYsJGHmZI 9GO0R8PsJv7IH2wtNU2iA0EFR/YyxtIDDBg2BdY+TmLo+JQmgAE1tpUyF33dZMWZxP1B09 iEe6QHmvxm+LMJtYwLKaiKhO0b2ElfOy7bcw+Ka3bW6OQ2AhLxrwKjNlehL9tg== X-Migadu-Spam-Score: -0.82 X-Spam-Score: -0.82 X-Migadu-Queue-Id: 6298C6FAB 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=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=gmail.com (policy=none) X-TUID: 4AJx0Pje4Jh5 On 14/01/2023 18:42, Ihor Radchenko wrote: > > <2023-01-14 Sat 18:22@Asia/Singapore> (SGD and similar abbreviations are often ambiguous) Such format is ambiguous for timezones with DST around backward time jump. Before/after time transition should be specified in addition, e.g. by combining identifier and offset or some way to state namely before or after. > <2023-01-14 Sat 18:22+0800> > <2023-01-14 Sat 18:22+08> > <2023-01-14 Sat 18:22@+0800> > <2023-01-14 Sat 18:22@+08> May become incorrect for future events due to updates of timezone database. > <2023-01-14 Sat 18:22@+08 +1w -5d> May be not suitable for time zones with DST since offset changes due to time transitions. I am afraid, sometimes rather long (maybe even redundant) specification is required, so overlays becomes must have (as for links) to keep readability.