[NZLUG] Fwd: [nznog] They're adding a "leap second" at Noon, Wednesday, 1 July 2015 NZ Standard Time {SECURITY=UNCLASSIFIED}

Mark Foster blakjak at blakjak.net
Fri Jan 16 11:05:49 NZDT 2015


FYI - some Linux machines had 'fun' last time this occurred. :)

Cheers
Mark
PS: LCA2015 has been a blast...


-------- Forwarded Message --------
Subject: 	[nznog] They're adding a "leap second" at Noon, Wednesday, 1 
July 2015 NZ Standard Time {SECURITY=UNCLASSIFIED}
Date: 	Thu, 15 Jan 2015 21:12:30 +0000
From: 	HENDERSON MIKE, MR <MICHAEL.HENDERSON at NZDF.mil.nz>
To: 	'NZNOG Mailing-List' <nznog at list.waikato.ac.nz>



Folks,

Some of you may not have noticed this in the post-Christmas doze …

What will happen is that on 30^th June [UTC time] the clock will go 
23:59:59 > 23:59:*60* > 00:00:00, instead of 23:59:59 > 00:00:00, i.e. 
an extra ‘leap’ second is inserted.

It will cause the odd issue or two, depending on your environment and 
operating system..

For example, if you should happen to use RHEL you could start here 
https://access.redhat.com/articles/15145

There were certainly issues in other Linux distributions (including 
Oracle Linux and SLES) last time this happened on 30^th June / 1^st July 
2012.

Regards

*/Mike/*

        __________________________________________

        *_Press Coverage_*:

        This year will be slightly longer after the Paris Observatory
        announced that it was adding a "leap second" at midnight [UTC]on
        June 30

        http://www.smh.com.au/technology/sci-tech/extra-second-to-be-added-to-2015-as-tech-companies-brace-for-problems-20150108-12k0yk.html

        _Note_: Midnight [UTC] on June 30 2015 is Noon, Wednesday, 1
        July 2015 NZ Standard Time

        *_Official Announcement_*:

        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 (0) 1 40 51 22 26

        FAX : 33 (0) 1 40 51 22 91

        e-mail : services.iers at obspm.fr <mailto:services.iers at obspm.fr>

        http://hpiers.obspm.fr/eop-pc

        Paris, 5 January 2015 Bulletin C 49

        To authorities responsible for the measurement and distribution
        of time UTC

        *TIME STEP on the 1st of July 2015*

        A positive leap second will be introduced at the end of June
        2015. The sequence of dates of the UTC second markers will be:
        2015 June 30, 23h 59m 59s 2015 June 30, 23h 59m 60s 2015 July 1,
        0h 0m 0s

        The difference between UTC and the International Atomic Time TAI
        is: from 2012 July 1, 0h UTC, to 2015 July 1 0h UTC : UTC-TAI =
        - 35s from 2015 July 1, 0h UTC, until further notice : UTC-TAI =
        - 36s

        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.

        Daniel Gambis

        Head

        Earth Orientation Center of IERS Observatoire de Paris, France

        http://datacenter.iers.org/eop/-/somos/5Rgv/latest/16
        <http://datacenter.iers..org/eop/-/somos/5Rgv/latest/16>

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