Time Zone information

[Allen, Jack]

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From: Phebe_Mertes at aotx.uscourts.gov
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Sent: Wednesday, March 11, 2009 2:43 PM
To: General Red Hat Linux discussion list
Subject: Re: Time Zone information


 

             "Allen, Jack"

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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.

-----
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 at 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



==========================
Thanks to all that replied so quickly.

I had tried the zdump command "zdump /etc/localtime", but it just
displayed the current date and time. The missing part was the "-v"
option and the greping for the year.

-----
Jack Allen