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 YNvyIcMo22OvcgEAbAwnHQ (envelope-from ) for ; Thu, 02 Feb 2023 04:06:43 +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 qEHgIcMo22ODUgAAauVa8A (envelope-from ) for ; Thu, 02 Feb 2023 04:06:43 +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 5EB083D807 for ; Thu, 2 Feb 2023 04:06:43 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pNPvB-0008GD-3H; Wed, 01 Feb 2023 22:05:57 -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 1pNPv9-0008Fq-Sk for emacs-orgmode@gnu.org; Wed, 01 Feb 2023 22:05:55 -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 1pNPv8-0004BN-In for emacs-orgmode@gnu.org; Wed, 01 Feb 2023 22:05:55 -0500 Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pNPv6-0007PV-Sj for emacs-orgmode@gnu.org; Thu, 02 Feb 2023 04:05:52 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: emacs-orgmode@gnu.org From: Max Nikulin Subject: Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Date: Thu, 2 Feb 2023 10:05:47 +0700 Message-ID: References: <87lelo8c9r.fsf@localhost> <2150768.1675077958@archlinux> <87tu063ox2.fsf@localhost> <87h6w63jgg.fsf@localhost> <86wn51g661.fsf@gmail.com> <87357pn57t.fsf@localhost> <86sffpg1bv.fsf@gmail.com> <87wn51ibcc.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: <87wn51ibcc.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: 27 X-Spam_score: 2.7 X-Spam_bar: ++ X-Spam_report: (2.7 / 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=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NICE_REPLY_A=-0.09, 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-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1675307203; 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=u+x/roWzpNA18rbwvSty+VArIZIMs1q44uYVVEU+0zA=; b=uWtKJl02Gms6lMfNKVjRih5v1fWtTn8K8Z+o5r4bxDaAmNRXRbIFtqj/Grh5VrdZ0WW16D 285IcwY4yvzrvjfHmITFgxN2mhBvdUddM+MjZN30d7ZGjSUAzPw1JmKW7uA1at+LjWQNg1 u8o4WR0WKYvA6MRtheO2HrnaeYn0TY/7kllmy5Tsm7gfPJvz2v089Tjytoztoan7alZddG Fsvpvwd+asbUOaQFcnG8uOBWkpXmi9uKuOglM8lg0jc7R43yWGULGv3tqVPkfGSxbageIS KbEF/Ato8zts7uce3bvczCcvj8Mmdy1IIF4nJkuKi3gN7+Tr31N9csKXsaKdMA== 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-Seal: i=1; s=key1; d=yhetil.org; t=1675307203; a=rsa-sha256; cv=none; b=YqmgCpPqjkyjSs2y0WjFW1L3RLEHy+q80urwcrYwbNwR8QhlQKpa9r65sDTxrV0oSnAbW7 IdIbA6aG1eHuZNxPvK6KgfJyDdOm1Pg31aBgYY+36Xukbs5UMCW+hojYsbf8zR9sjeudb2 8Mh0jrB1E/EE0qIcuCLbFezrCUpBPgH8ZNtaRMdQLPalu/qt1KtGwaHdMgKJUyR0XxUVEW yM5PriE2Iuy0OKrTrD9UvPLOHofvSPwhnSfpQrOvXYiWPRkoNGwv6Ko5B0RK+cxV4royfm mG+OhEsTZUrGPNTGF48Zzki6WhnhKvoXk9ZdE05X7mXb14Ym55cFou5n4Gy/bw== 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-Migadu-Scanner: scn0.migadu.com X-Spam-Score: -1.28 X-Migadu-Queue-Id: 5EB083D807 X-Migadu-Spam-Score: -1.28 X-TUID: i1imaXikrvjk On 01/02/2023 23:45, Ihor Radchenko wrote: > > Note how `encode-time' TIME argument has both DST flag and the time zone > name: > > (SECOND MINUTE HOUR DAY MONTH YEAR IGNORED DST ZONE) > > DST is necessary exactly in the ambiguous situations like I described, > when we must know if day saving time is in effect or not __in addition__ > to time zone name. Warning: just be aware that sometimes DST is not enough to resolve ambiguity. E.g. in the following example attempt to pass non-nil DST signals an error: zdump -v Africa/Juba | grep 2021 Africa/Juba Sun Jan 31 20:59:59 2021 UT = Sun Jan 31 23:59:59 2021 EAT isdst=0 gmtoff=10800 Africa/Juba Sun Jan 31 21:00:00 2021 UT = Sun Jan 31 23:00:00 2021 CAT isdst=0 gmtoff=7200