Re: [Rd] .leap.seconds

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Fri 13 Jan 2006 - 03:26:43 GMT

You don't seriously expect R 2.2.1 to know about events after its release do you? And as the new leap second is not a bug, it will not go into a patched version.

I have been looking into this for R-devel, but there is a lot more to it. We really need consistency with the OS, and as this leap second was not even announced until 2005-07-04, probably most R platforms will not know about it. Some systems count leapseconds in their clock time, but most do not: see ?DateTimeClasses. So we need to find out if the OS knows about this leap second when we make internal adjustments, and even that is tricky as e.g. FC3 as originally shipped does not but the latest patched glibc does. I am not convinced I have a good enough solution as yet.

On Thu, 12 Jan 2006, McGehee, Robert wrote:

> I glanced at the .leap.seconds object and noticed that it has not been
> updated for the most recent leap second that occurred 2005 December 31,
> 23h 59m 60s. See the IERS bulletin here:
> http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat
>
> Moreover, after a more careful glance at the .leap.seconds object, I
> noticed that there are two incorrect entries. First, there was not a
> leap second on 1986 June 30, and second there was a leap second that was
> omitted on 1982 June 30.

A (harmless) typo.

> For a list of past offsets see this IERS table:
> http://www.iers.org/MainDisp.csl?pid=95-106
>
> Best,
> Robert
>
>> version
> platform i686-pc-linux-gnu
> arch i686
> os linux-gnu
> system i686, linux-gnu
> status Patched
> major 2
> minor 2.1
> year 2006
> month 01
> day 07
> svn rev 37024
> language R
>
> Robert McGehee
> Quantitative Analyst
> Geode Capital Management, LLC
> 53 State Street, 5th Floor | Boston, MA | 02109
> Tel: 617/392-8396 Fax:617/476-6389
> mailto:robert.mcgehee@geodecapital.com
>
>
>
> This e-mail, and any attachments hereto, are intended for us...{{dropped}}
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Fri Jan 13 14:33:21 2006

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