daylight saving time algorithm changing

[Michael Garvin]

The binary files are compiled with 'zic' from zoneinfo timezone source files.
On Solaris, the source files are in:

/usr/share/lib/zoneinfo/src

along with a "README" describing how it does it.  They (Sun/Solaris) track
the source files from:

ftp://elsie.nci.nih.gov/pub/

So, presumably your tax dollars will fund getting these files updated.  Note
that they haven't been since 14-Jul-2005.

The source files describe (essentially) date ranges for the time changes
(since they've been changed a few times, and have some variance) and when and
how to make the change.  Therefore, you should be able to manually update the
logic and recompile using 'zic', but you're probably safer waiting for the
appropriate vendor(s) to issue patches...

See also 'zdump'.

HTH,

 - Mike

> From: ncsa-discussion-bounces at ncsysadmin.org [mailto:ncsa-discussion-
> bounces at ncsysadmin.org] On Behalf Of Rick DeNatale
> Sent: Tuesday, August 09, 2005 10:14 AM
> To: NC*SA Discussion List
> Subject: Re: daylight saving time algorithm changing
> 
> So my curiosity is piqued. I tried to figure out what the format of
> the timezone data files is. Googling various things failed to turn up
> any documentation on what is inside these files.
> 
> Does anyone know where they are documented?  Is it possible that they
> can descibe not only what the rules for dst are in a particular
> timezone, but also that the rules are x now and they change to y on
> such and such a date?

--
Michael Garvin - SCSA, SCNA, SCSA Security
   Systems Programmer/Analyst
MCNC
   3021 Cornwallis Road, PO Box 12889, RTP, NC 27709-2889
(919) 248-9212
mgarvin at mcnc.org
http://www.mcnc.org/