From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 7F80F3858C52 for ; Fri, 19 Aug 2022 18:15:26 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 7F80F3858C52 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-380-v-t6Gk7cNxawq1zdq9_krw-1; Fri, 19 Aug 2022 14:15:22 -0400 X-MC-Unique: v-t6Gk7cNxawq1zdq9_krw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A749E85A581; Fri, 19 Aug 2022 18:15:22 +0000 (UTC) Received: from greed.delorie.com (unknown [10.22.8.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 769AA140EBE3; Fri, 19 Aug 2022 18:15:22 +0000 (UTC) Received: from greed.delorie.com.redhat.com (localhost [127.0.0.1]) by greed.delorie.com (8.15.2/8.15.2) with ESMTP id 27JIFLGW1089327; Fri, 19 Aug 2022 14:15:21 -0400 From: DJ Delorie To: Paul Eggert Cc: libc-alpha@sourceware.org, carlos@redhat.com Subject: Re: [swbz 29035] mktime vs non-DST In-Reply-To: Date: Fri, 19 Aug 2022 14:15:21 -0400 Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Aug 2022 18:15:28 -0000 Paul Eggert writes: > Perhaps see what FreeBSD etc. do with your examples? That might be helpful. FreeBSD does this, which matches your patched version: "America/New_York", 1615705199, = Sun, 2021-Mar-14 6:59:59 = Sun, 2021-Mar-14 1:59:59 = 0 -18000 1615705199 -> Sun Mar 14 06:59:59 2021 gmt, or Sun Mar 14 01:59:59 2021 local - UNK:1615705199 returned Sun, 2021-Mar-14 1:59:59 STD - STD:1615705199 returned Sun, 2021-Mar-14 1:59:59 STD broken isdst=1: 1615701599 instead of 1615705199 (-3600) - DST:1615701599 returned Sun, 2021-Mar-14 0:59:59 STD "America/New_York", 1615705200, = Sun, 2021-Mar-14 7:00:00 = Sun, 2021-Mar-14 3:00:00 = 1 -14400 1615705200 -> Sun Mar 14 07:00:00 2021 gmt, or Sun Mar 14 03:00:00 2021 local - UNK:1615705200 returned Sun, 2021-Mar-14 3:00:00 DST broken isdst=0: 1615708800 instead of 1615705200 (+3600) - STD:1615708800 returned Sun, 2021-Mar-14 4:00:00 DST - DST:1615705200 returned Sun, 2021-Mar-14 3:00:00 DST "America/New_York", 1636264799, = Sun, 2021-Nov-07 5:59:59 = Sun, 2021-Nov-07 1:59:59 = 1 -14400 1636264799 -> Sun Nov 7 05:59:59 2021 gmt, or Sun Nov 7 01:59:59 2021 local "America/New_York", 1636264800, = Sun, 2021-Nov-07 6:00:00 = Sun, 2021-Nov-07 1:00:00 = 0 -18000 1636264800 -> Sun Nov 7 06:00:00 2021 gmt, or Sun Nov 7 01:00:00 2021 local "America/New_York", 1641038400, = Sat, 2022-Jan-01 12:00:00 = Sat, 2022-Jan-01 7:00:00 = -1 -18000 1641038400 -> Sat Jan 1 12:00:00 2022 gmt, or Sat Jan 1 07:00:00 2022 local - UNK:1641038400 returned Sat, 2022-Jan-01 7:00:00 STD - STD:1641038400 returned Sat, 2022-Jan-01 7:00:00 STD broken isdst=1: 1641034800 instead of 1641038400 (-3600) - DST:1641034800 returned Sat, 2022-Jan-01 6:00:00 STD "America/New_York", 1656676800, = Fri, 2022-Jul-01 12:00:00 = Fri, 2022-Jul-01 8:00:00 = -1 -14400 1656676800 -> Fri Jul 1 12:00:00 2022 gmt, or Fri Jul 1 08:00:00 2022 local - UNK:1656676800 returned Fri, 2022-Jul-01 8:00:00 DST broken isdst=0: 1656680400 instead of 1656676800 (+3600) - STD:1656680400 returned Fri, 2022-Jul-01 9:00:00 DST - DST:1656676800 returned Fri, 2022-Jul-01 8:00:00 DST "Asia/Tokyo", 1641038400, = Sat, 2022-Jan-01 12:00:00 = Sat, 2022-Jan-01 21:00:00 = -1 32400 1641038400 -> Sat Jan 1 12:00:00 2022 gmt, or Sat Jan 1 21:00:00 2022 local - UNK:1641038400 returned Sat, 2022-Jan-01 21:00:00 STD - STD:1641038400 returned Sat, 2022-Jan-01 21:00:00 STD broken isdst=1: 1641034800 instead of 1641038400 (-3600) - DST:1641034800 returned Sat, 2022-Jan-01 20:00:00 STD "Asia/Tokyo", 1656676800, = Fri, 2022-Jul-01 12:00:00 = Fri, 2022-Jul-01 21:00:00 = -1 32400 1656676800 -> Fri Jul 1 12:00:00 2022 gmt, or Fri Jul 1 21:00:00 2022 local - UNK:1656676800 returned Fri, 2022-Jul-01 21:00:00 STD - STD:1656676800 returned Fri, 2022-Jul-01 21:00:00 STD broken isdst=1: 1656673200 instead of 1656676800 (-3600) - DST:1656673200 returned Fri, 2022-Jul-01 20:00:00 STD