From nobody Wed Nov 29 11:36:13 2023 X-Original-To: freebsd-questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4SgHNP4bshz52ZvG for ; Wed, 29 Nov 2023 11:36:53 +0000 (UTC) (envelope-from kudzu@tenebras.com) Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4SgHNN58zCz4G6s for ; Wed, 29 Nov 2023 11:36:52 +0000 (UTC) (envelope-from kudzu@tenebras.com) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=tenebras-com.20230601.gappssmtp.com header.s=20230601 header.b=0cAPV+wJ; spf=none (mx1.freebsd.org: domain of kudzu@tenebras.com has no SPF policy when checking 2607:f8b0:4864:20::532) smtp.mailfrom=kudzu@tenebras.com; dmarc=none Received: by mail-pg1-x532.google.com with SMTP id 41be03b00d2f7-5c5f0e325a6so1012168a12.1 for ; Wed, 29 Nov 2023 03:36:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tenebras-com.20230601.gappssmtp.com; s=20230601; t=1701257810; x=1701862610; darn=freebsd.org; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=ggsbx7HaeyDdO/op/j+lSYSnz2/HoS0V65K4VogHAF8=; b=0cAPV+wJr++vYGxPRH2qrWdvUrufZ1cOPR+AjU6ArzgoLmEDdGupmUUfN02tpQd3x5 +2yiTfkmuubEd6BQcKq6Jgf+TDRlhvbkcj9+cOgmPWUb9rmoycz2j+eMRXuSZdVKq24L Di7IGOu9h480cYRD8iKahVC5u2zNJHRGBqc5jEAKPK4y6860/dS3v19lUtRH+6gz7UjS wQmFZne5QtZczVBhd4cUFXfQImOYxy0jdr8sUpS9U9VRDG1/3Vh5G/PwiNsI0Gt5aNsD sFqV85ErtJfhTjB2oigbJSULJcNza79lBtJy8XQbHnU6zxu98sQ4QrtKPse1MzNIYdOd GoOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701257810; x=1701862610; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ggsbx7HaeyDdO/op/j+lSYSnz2/HoS0V65K4VogHAF8=; b=RPf9KmnEpxaoUNfWGd6zv5QdXGeVr+PJZi2jGsaaHXXUyHzbFcPZJvY+7m1T/Trv1n Vn9c/7TlWGQoxJ7qXmlo2z9EFz24Wqw73avtxyV5ec02gx8hwiOSZ/BczHU6cHYWidki pL8SOnVPntqcd80pp9v+DXTjPTvlx5AeVbdjbzH285U9HPRDJZSBdPB6DTrypTFFki6O RgqdZlplCpB7mPByf1wh7BkWS+uF3QvRgd/2pncvkhIR1rTuxabyAldE6+dUn5zvKzjV IcLnJcJ2DYc0Gz8agrPslvuX4O5Z2EHtCObEbC9ALK2r9Bw793rj/1T7bgzmDyW1ZNu7 kJ9A== X-Gm-Message-State: AOJu0Yz+3HIa8spTldLdn8w8PJ5ZhWwoDhEG9ufo6PXPNfiO4L0RvSeE T4bspKS0AaLvMYhNkXBUn7KY/t961aLqvTvWXfNaeAvyWPnFWFZM X-Google-Smtp-Source: AGHT+IF386NwFsz90hweC/uVq/GTOkwBO5sfwY72WK9ET02dibdawn4/GDprhlxuiwwM/3+sePS88hjaYYObjG8wBnE= X-Received: by 2002:a05:6a20:5490:b0:135:1af6:9a01 with SMTP id i16-20020a056a20549000b001351af69a01mr19194858pzk.8.1701257809958; Wed, 29 Nov 2023 03:36:49 -0800 (PST) List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 References: <1749db2d-757f-4fc1-ba5c-f1b05fbb40f3@cloudzeeland.nl> <20231128102806.1bd6ef76a878e98dbb11bf2c@sohara.org> <5541217f-f86e-4308-a4b0-5728472e2102@nebelschwaden.de> In-Reply-To: From: Michael Sierchio Date: Wed, 29 Nov 2023 06:36:13 -0500 Message-ID: Subject: Fwd: NTPD leap second file To: FreeBSD Questions Content-Type: multipart/alternative; boundary="0000000000006f2d07060b48f32a" X-Spamd-Result: default: False [-3.30 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.999]; NEURAL_HAM_LONG(-1.00)[-0.996]; R_DKIM_ALLOW(-0.20)[tenebras-com.20230601.gappssmtp.com:s=20230601]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; DMARC_NA(0.00)[tenebras.com]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::532:from]; FROM_HAS_DN(0.00)[]; TO_DN_ALL(0.00)[]; ARC_NA(0.00)[]; RCVD_COUNT_ONE(0.00)[1]; DKIM_TRACE(0.00)[tenebras-com.20230601.gappssmtp.com:+]; MLMMJ_DEST(0.00)[freebsd-questions@freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; R_SPF_NA(0.00)[no SPF record] X-Rspamd-Queue-Id: 4SgHNN58zCz4G6s X-Spamd-Bar: --- --0000000000006f2d07060b48f32a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable ---------- Forwarded message --------- From: Michael Sierchio Date: Wed, Nov 29, 2023 at 6:35=E2=80=AFAM Subject: Re: NTPD leap second file To: On Tue, Nov 28, 2023 at 6:34=E2=80=AFAM Ede Wolf = wrote: Should only happen at the very end of the year, if at all. I am not > aware of the next planned leap second. But that does not mean anything, > of course. The UTC standard allows leap seconds to be applied at the end of any UTC month, with first preference to June and December and second preference to March and September. Leap seconds may be positive or negative, and up to 2 may be applied at once. Linear leap smearing is applied by Google's NTP servers, and by the NTP servers in AWS EC2 service =E2=80=93 this solves the problem of discontinui= ty or non-monotonicity in timekeeping. --0000000000006f2d07060b48f32a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


---------- Forwarded message ---------
From: Michael Sierchio <kudzu@tenebras.com>=
Date: Wed, Nov 29, 2023 at 6:35=E2=80=AFAM
Subject: Re: NTPD = leap second file
To: <lis= tac@nebelschwaden.de>



On Tue, Nov 28, 2023 at 6:34=E2=80= =AFAM Ede Wolf <listac@nebelschwaden.de> wrote:

Should only happen at the very end of the year, if at all. I am not
aware of the next planned leap second. But that does not mean anything, of course.

The UTC standard allows leap sec= onds to be applied at the end of any UTC month, with first preference to Ju= ne and December and second preference to March and September.
Leap seconds may be positive or negative, and up to 2 may be applied at on= ce.=C2=A0

Linear leap smearing is applied by Google's NTP server= s, and by the NTP servers in AWS EC2 service =E2=80=93 this solves the prob= lem of discontinuity or non-monotonicity in timekeeping.

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