Date: Wed, 29 Nov 2023 06:36:13 -0500 From: Michael Sierchio <kudzu@tenebras.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Fwd: NTPD leap second file Message-ID: <CAHu1Y72CrfEiXtEMbAuKAj2ELGDF4mi12q338Pv-FgsJeMJWpQ@mail.gmail.com> In-Reply-To: <CAHu1Y71W4UYbQAzX76jLOvnf7oTWnoNnEGhoJAHMvMpfdWGBUA@mail.gmail.com> References: <1749db2d-757f-4fc1-ba5c-f1b05fbb40f3@cloudzeeland.nl> <20231128102806.1bd6ef76a878e98dbb11bf2c@sohara.org> <5541217f-f86e-4308-a4b0-5728472e2102@nebelschwaden.de> <CAHu1Y71W4UYbQAzX76jLOvnf7oTWnoNnEGhoJAHMvMpfdWGBUA@mail.gmail.com>
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--0000000000006f2d07060b48f32a Content-Type: text/plain; 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: <listac@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 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 <div dir=3D"ltr"><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" class= =3D"gmail_attr">---------- Forwarded message ---------<br>From: <strong cla= ss=3D"gmail_sendername" dir=3D"auto">Michael Sierchio</strong> <span dir=3D= "auto"><<a href=3D"mailto:kudzu@tenebras.com">kudzu@tenebras.com</a>>= </span><br>Date: Wed, Nov 29, 2023 at 6:35=E2=80=AFAM<br>Subject: Re: NTPD = leap second file<br>To: <<a href=3D"mailto:listac@nebelschwaden.de">lis= tac@nebelschwaden.de</a>><br></div><br><br><div dir=3D"ltr"><div dir=3D"= ltr"><div dir=3D"ltr"><div dir=3D"ltr"><br></div><div class=3D"gmail_quote"= ><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Nov 28, 2023 at 6:34=E2=80= =AFAM Ede Wolf <<a href=3D"mailto:listac@nebelschwaden.de" target=3D"_bl= ank">listac@nebelschwaden.de</a>> wrote:</div><div dir=3D"ltr" class=3D"= gmail_attr"><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px= 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> Should only happen at the very end of the year, if at all. I am not <br> aware of the next planned leap second. But that does not mean anything, <br= > of course.</blockquote><div><br></div><div>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.</div><div><br= >Leap seconds may be positive or negative, and up to 2 may be applied at on= ce.=C2=A0<br><br>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.</div><div><br></di= v></div></div></div></div> </div></div> --0000000000006f2d07060b48f32a--
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