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Re: [Ntp] Finding leap-seconds.list

Sanjeev Gupta <ghane0@gmail.com> Thu, 08 November 2018 15:41 UTC

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References: <5884DA3A-B95B-4D6B-9A31-E964CE4F02EF@gmail.com> <53bc1310-c198-557a-54ca-57b5b0af9bcb@meinberg.de> <AM6PR0602MB3733A11C62B7A0ED49F318B5FFC40@AM6PR0602MB3733.eurprd06.prod.outlook.com> <48e4f43d-629a-b365-2098-d014528f8556@cs.ucla.edu> <ff1b7f92-ac40-99f1-9d27-b1c02d329bc8@meinberg.de>
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From: Sanjeev Gupta <ghane0@gmail.com>
Date: Thu, 08 Nov 2018 23:41:35 +0800
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To: martin.burnicki@meinberg.de
Cc: Paul Eggert <eggert@cs.ucla.edu>, denis.reilly@orolia.com, hidinginthebbc@gmail.com, ntp@ietf.org
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Subject: Re: [Ntp] Finding leap-seconds.list
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On Thu, Nov 8, 2018 at 4:20 PM Martin Burnicki <martin.burnicki@meinberg.de>
wrote:

> However, keeping in mind that the leap second file has an expiration
> date, maybe a new version of TZDB should also be released whenever this
> file has been updated (that would be twice a year).
>
> If I remember correctly a new release of TZDB is only rolled out when
> another timezone change has to be propagated, so the leap second file
> via TZDB becomes available more or less delayed.
>

The tzdb updates frequently (we have had 7 so far this year, and a couple
more may still happen as countries adjust their Mar DST settings).

IERS issues Bulletin C early in Jan and July each year, even when no change
is planned.  A list of previous bulletins is here:
 https://datacenter.iers.org/availableVersions.php?id=16

I estimate that there are about 60 changes to tzdb, and 4 releases, every
six months.  A leap second gets added every couple of years.or so.  It is
unlikely that tzdb would not have a current and correct copy of the IERS
Bulletin.

-- 
Sanjeev Gupta
+65 98551208     http://www.linkedin.com/in/ghane

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