Leap second announcement July 2022
https://datacenter.iers.org/data/latestVersion/16_BULLETIN_C16.txt There will be no leap second at the end of Dec. 2022. The leap second file expiration date should be updated prior to releasing 2022b. Howard
On Fri, 8 Jul 2022 at 10:45, Howard Hinnant via tz <tz@iana.org> wrote:
https://datacenter.iers.org/data/latestVersion/16_BULLETIN_C16.txt
There will be no leap second at the end of Dec. 2022. The leap second file expiration date should be updated prior to releasing 2022b.
Noted. The announcement was made by IERS on Monday 4 July, but at time of writing, NIST have not published an updated version of the file yet; I've been checking periodically. ;) The first Bulletin D in a year was also published this week, announcing that DUT1 signals will change from -0.1 to 0.0 on 28 July 2022: https://datacenter.iers.org/data/latestVersion/17_BULLETIN_D17.txt This is the second consecutive positive (or perhaps "backwards") step in DUT1 transmissions, as the average recent day length remains slightly short of 86,400 SI seconds. While UT1-UTC approaching zero definitionally means we're now about as far as we can get from needing a leap second (without, of course, having just had one), if this trend continues, we'll soon be closer to needing a negative leap second than a positive one. -- Tim Parenti
Per IERS, Bulletin C 64 (2022-07-05) https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.64 …and forwarded below. A patch updating leap-seconds.list from NIST is attached, and is installed in the development repository. -- Tim Parenti ---------- Forwarded message --------- From: IERS EOP Product Center <iers.eoppc@obspm.fr> Date: Tue, 5 Jul 2022 at 07:20 Subject: Bulletin C number 64 To: <bulc.iers@obspm.fr> INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE DE L'IERS OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : +33 1 40 51 23 35 e-mail : services.iers@obspm.fr http://hpiers.obspm.fr/eop-pc Paris, 05 July 2022 Bulletin C 64 To authorities responsible for the measurement and distribution of time INFORMATION ON UTC - TAI NO leap second will be introduced at the end of December 2022. The difference between Coordinated Universal Time UTC and the International Atomic Time TAI is : from 2017 January 1, 0h UTC, until further notice : UTC-TAI = -37 s Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date. Christian BIZOUARD Director Earth Orientation Center of IERS Observatoire de Paris, France
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Howard Hinnant -
Tim Parenti