From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp11.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 TB6SKjiDw2MYVAAAbAwnHQ (envelope-from ) for ; Sun, 15 Jan 2023 05:38:16 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp11.migadu.com with LMTPS id mE3mKTiDw2MWCgAA9RJhRA (envelope-from ) for ; Sun, 15 Jan 2023 05:38:16 +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 3DA5E46BF0 for ; Sun, 15 Jan 2023 05:38:16 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pGuli-0007lg-M5; Sat, 14 Jan 2023 23:37:18 -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 1pGuld-0007l7-Uu for emacs-orgmode@gnu.org; Sat, 14 Jan 2023 23:37:15 -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 1pGulc-0004JA-F5 for emacs-orgmode@gnu.org; Sat, 14 Jan 2023 23:37:13 -0500 Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pGula-0002BZ-Gs for emacs-orgmode@gnu.org; Sun, 15 Jan 2023 05:37:10 +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 11:37:04 +0700 Message-ID: References: <63c287ca.a70a0220.4bd14.873b@mx.google.com> <87pmbh1hgx.fsf@localhost> <63c2b8e4.a70a0220.e3b6d.0051@mx.google.com> <87edrxyyeq.fsf@localhost> <87bkn1yx59.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: <87bkn1yx59.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=1673757496; a=rsa-sha256; cv=none; b=G2Ih3kvCthg637z116EHx32HYtNTfqXnwiH/IAsgn5MAoqia6pjFPX5mpyu3YL3lN/7PP1 ixR3PpSsq64Dvpa2QQajuNZkHwzNgjtulhM6B9h+lvRBAjIxWZAcjXjCKnn2KbIhcM2qli qPpiGP4avDpShLn7lo0VB1WxISb4zUpMec8tpTa/62db18vKMfhZFOX/hyGyl4oaf2dLqa +usIkoSD/XDf61zvHjyOkk6BymgNfvh61e9dR0vBo6wK8EnxUFc1o9TARyJi+rjUvEmQ4v BbEdBaWSJrJBVUPGLdDQrtmaE8F72/Y9oa5eeNRlSHUqNmwAxEKUSCRna5kHhg== 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=1673757496; 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=MS6xsRsPbq499Kff6uAlFUtssrtKFu5ThhJ3Iw+9G0k=; b=h/L4aNohP6utIK6SGFqdOuPq53WXTouC6nMPPLYz2vsOdKSY9nBWf76U2p5Qrb/BMeSfeO hKmeu3rI9eSLu+JmWp2bDJTZe1jr+n3Dd9M9TqhvNV+NhYv6k6Nok0Tv/5W5rPoZIIEwQ7 Re6QecdSyT714WdMpyXGOMFV4zRnz8lM97PqIJ6JL3pKOjPzKAnoz1sbeFEKJApEuNbz0I 3U0Tw4RYlWmYE1z2spxCeoB+4DDL6g6BVVbUSOCOe/6k4bCtEqdIRGCIS6yenZ5KUz6JV4 TH76UNCKjzQ0aiN8TtyZEKCKSnEfAFrF3PBE7A1OCz4iRcQN/I1tqaVvY7+jQA== X-Migadu-Spam-Score: -0.82 X-Spam-Score: -0.82 X-Migadu-Queue-Id: 3DA5E46BF0 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: b4WQ/pAzeeWy On 14/01/2023 22:05, Ihor Radchenko wrote: > In addition, we may provide some mechanism to set the time zone for: > 1. Individual files > 2. For all files, including possible time zone transitions over time. > > What I mean by (2) is when the user travels from, say, Australia to USA, > it could be possible to say: Use Australia/Seattle up to certain time > and then use USA/Austin. I like this idea. Having a time handling library supporting custom ad hoc timezones it would be possible to create a special zone for such trip. Its time offset and naming rules follows locations of the trip. As a result, supplying various timezones to agenda generation code it would be possible to generate schedule for - the traveling user with time local to each trip point (custom TZ) - colleagues and relatives staying at the departure point (original TZ) - accepting party (destination TZ) For a timestamp without explicit timezone it may be obtained from - subtree or file property (single value or list of time intervals reflecting history of timezone changes) - buffer local variable (single TZ or history) - global org variable (single TZ or history) - timezone (single value) set inside libc (e.g. initialized from the TZ environment or changed by code) - system timezone.