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Old 02-11-2007, 09:20 PM   #1
mnauta
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FC4 and Daylight Savings Time


I have an FC4 server running, will I have problems with the Daylight savings time switch coming early this year (March 11)?

Thanks
Manuel
 
Old 02-12-2007, 05:10 AM   #2
unSpawn
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AFAIK not if you keep the box updated the right way.
 
Old 02-12-2007, 07:14 AM   #3
mnauta
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Originally Posted by unSpawn
AFAIK not if you keep the box updated the right way.
I kept it up to date until legacy fedora updates shutdown. How would I know what is responsible for the daylight savings time update? I have set the server to get time from a time server.
 
Old 02-12-2007, 07:50 AM   #4
unSpawn
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I kept it up to date until legacy fedora updates shutdown.
And that's why Capt_Caveman posted the sticky in this forum.


How would I know what is responsible for the daylight savings time update?
Tzdata package as far as I know. Also-see-threads:
http://www.linuxquestions.org/questi...d.php?t=518147
http://www.linuxquestions.org/questi...d.php?t=518752
 
Old 02-12-2007, 10:13 AM   #5
wmakowski
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Some good threads provided by unSpawn. I'll try to explain a little on how the time is adjusted for DST. I researched this last year to adjust an old system I keep around.

Depending on how you set up your system the system clock will either be set to UTC or localtime. The only instance when that time actually changes will be if you are using ntp or you adjust it manually with the bios or hwclock command. The system clock does not change when DST kicks in or out.

The time shown or used by an individual user can be set with the TZ environment variable. For example someone in Tokyo can see their localtime when working on a machine in Cleveland. If this environment variable is not set it will default to the timezone indicated by the file /etc/localtime.

The individual zoneinfo files are located in /usr/share/zoneinfo. As unSpawn mentioned these are supplied by the tzdata package. It is common to set up a symlink with one of these files and /etc/localtime. I've also seen where the desired zoneinfo file is copied to /etc/localtime. These files have timezone rules and automatically make adjustments to the time shown to a user.

As long as you keep the zoneinfo files updated you will not have any problems with DST. It is also possible to create your own zoneinfo file. If for example someone has a unique situation and new information about their timezone had not been updated in the tzdata package they could build the necessary zoneinfo file using zic. You can see the rules for any zoneinfo file using the command zdump.

Bill
 
  


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