"Allen, Jack"
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son.com> To
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03/11/2009 01:29 Time Zone information
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Hello:
I have a customer that is running RH AS 4.7 and the time did not
change this weekend as it was suppose to. I know the time zone for the
system is located in /etc/localtime. I searched the web for a command
that would dump the information to show if it is the correct one they
should be using, but I was not able to find anything. During my
searching I kept running across things that said that /etc/localtime was
a symbolic link to /usr/share/zoneinfo/*. On the customer's systems and
mine /etc/localtime is not a symbolic link. So this could be the problem
on their system if the tzdata update, updated the time zone information
in /usr/share/zoneinfo/* assuming /etc/localtime would be pointing to
the correct updated file.
So should it be a symbolic link?
How can I display the information in a time zone file to se the
settings.
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Thanks:
Jack Allen
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>From an old how to doc:
HOW TO TEST FOR DAYLIGHT SAVINGS DATES
# use appropriate year
zdump -v /etc/localtime |grep 2007
IF THE DATES ARE INCORRECT CAN
# have to choose the package for your time zone, mine was Chicago
update /etc/localtime by hand after installing the latest tzdata package.
cp /usr/share/zoneinfo/America/Chicago /etc/localtime
ONCE UPDATED, ALL SERVICES USING /ETC/LOCAL HAVE TO BE RESTARTED
service ntpd restart
081231: BUT! it takes minutes to hours before ntpd gets properly synced to
show you the localtime.
if a date command give UTC, it has not done it's syncing yet.
090310: can force the sync with ntpq -gxq (I was told)
run this command
[root@blade5 /]# zdump -v /etc/localtime | grep 2007
/etc/localtime Sun Mar 11 07:59:59 2007 UTC = Sun Mar 11 01:59:59 2007 CST
isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT
isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 4 06:59:59 2007 UTC = Sun Nov 4 01:59:59 2007 CDT
isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 4 07:00:00 2007 UTC = Sun Nov 4 01:00:00 2007 CST
isdst=0 gmtoff=-21600
and it shows the new daylight savings time.
RHEL4 handles updating older systems this way:
http://kbase.redhat.com/faq/FAQ_85_9951.shtm
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