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Re: Timezone info



Lunt, Nick wrote:
Thanks for your help, but how do I see what time change rules are in the zone
file ?

My /etc/localtime is a symlink to /usr/share/zoneinfo/Europe/London.

$ strings /etc/localtime TZif BDST $

From that output I cannot tell that the time will change at 2am.

man tzfile and man tzset do not seem to show me how to change the time at
which I would like the machine to start interpreting daylight savings time.


If zoneinfo file contains correct rules it will be the same moment as set
by the government. Therefore, you will not have any problems with the
time change.



This is important because we have Oracle running on these machines, and
Oracle does not react well to time changes.

On our HPUX boxes we have a /usr/lib/tztab file in which we can specify at
what time to move over to daylight saving, and we schedule Oracle to be down
at this time. Am I correct in thinking that we do not have this functionality
on RH ?

Thanks, Nick .


Sorry you won't get this answer in time...

You can get the full gory details from zdump.

# zdump -v Europe/London
...
Europe/London Sun Oct 30 00:59:59 2005 UTC = Sun Oct 30 01:59:59 2005 BST isdst=1 gmtoff=3600 Europe/London Sun Oct 30 01:00:00 2005 UTC = Sun Oct 30 01:00:00 2005 GMT isdst=0 gmtoff=0
...

So the timezone info says the clocks go back at 2am.

You can create new timezone files with zic. Or specify custom timezone information in the TZ environment variable. Changing the timezone does require a reboot for all the system processes and daemons to pick up the change.

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw ion le ac uk
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555



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