[K12OSN] DST Changes?

Jim McQuillan jam at mcquil.com
Thu Mar 15 18:01:06 UTC 2007


I had a similar problem with a RHEL3 machine.  I installed the tzdata 
package, and the zdump command shown below worked, but the date still 
didn't show right after the DST switch over on sunday.

I found the problem was the /etc/localtime

On some systems its a file that contains timezone info.  On other 
systems it's a symlink to a file (in my case /usr/share/zoneinfo/EST5EDT).

when you run a command that gets the current time, like the 'date' 
command, it looks at /etc/localtime.  if that file or link isn't 
correct, it'll still report the wrong time.

So, either you need to re-point that symlink at the correct zoneinfo 
file, or you need to copy the correct zoneinfo file on top of it.

save a copy of the original file tho.  And, there should be no problem 
doing this while the system is running.

Jim McQuillan
jam at Ltsp.org

Shawn Powers wrote:
> I thought my servers were all OK -- but I missed one.  I have a lowly 
> ol' FC1 box, and there appears to be no tzdata update.  I did get one 
> that someone had compiled, and now the tzdata is correct, but is there 
> anyway short of a reboot to get the system to "look again" at the tzdata 
> and change the clock?  I don't know what process might manage that...
> Thanks for any insight,
> -Shawn
> On Feb 23, 2007, at 1:52 PM, Petre Scheie wrote:
>> Most distros put out patches for the new DST almost two years ago when 
>> the law changing DST was enacted.  So, if you've been keeping your 
>> system updated, you should already be covered.
>> To see if you're patched, run this:
>> /usr/sbin/zdump -v US/Central |grep 2007
>> Substitute your own timezone for Central.  It will show you when DST 
>> will start and end for your timezone.  If you see dates of Mar 11 and 
>> Nov 4, you're covered.
>> Petre
>> Jim Kronebusch wrote:
>>> Does anyone know if most linux distros have already incorporated 
>>> updates for
>>> the new daylight savings time changes?
>>> I have seen things regarding updates for MS and Apple products, but 
>>> nothing on
>>> Linux.
>>> Thanks,
>>> Jim Kronebusch
>>> Cotter Tech Department
>>> 507-453-5188
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> -- 
> Shawn Powers
> Technology Director
> Inland Lakes Schools
> PHN: 231-238-6868 x9174
> FAX: 509-356-7024
> spowers at inlandlakes.org
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