[CentOS] yum and yumex change system time

Wed Jun 24 01:25:16 UTC 2015
Johnny Hughes <johnny at centos.org>

On 06/23/2015 04:47 PM, g wrote:
> 
> Richard, thank you for your response.
> 
> 
> On 06/23/2015 02:51 PM, Richard wrote:
> <<>>
> 
>> I agree, so my questions are:
>>
>>    - what is your TZ?
> 
> u.s.a. 'central time zone' - currently on 'daylight savings time'.
> 
>>    - what does "[/bin/]date" show?
> 
>   [geo at boxen ~]$ date
>   Tue Jun 23 14:54:42 CDT 2015
> 
>>    - what does your hardware clock: "/sbin/hwclock --show"  report?
>>       [need to be root to use that command]
> 
>   [geo at boxen ~]$ sudo hwclock --show
>   [sudo] password for geo:
>   Tue 23 Jun 2015 02:55:40 PM CDT  -0.899861 seconds
> 
>>    - is your /etc/localtime file a standalone file or a symlink
>>        to /usr/share/zoneinfo/... ?
> 
> currently it is a copy of file from /usr/share/zoneinfo/ on advice
> from a post to this list when i had problem getting correct time to
> show in clock in panel.
> 
>>       - if a symlink, to what file?
> 
> see above answer.
> 
>>       - what is the timestamp on the localtime (or what it's
>>           symlinked to) file?
> 
>    2015-06-18 20:50
> 
> this file was copied several months ago so time stamp shows file has
> been updated.
> 
>>    - what does "zdump -v /etc/localtime" return ? i.e., is it for
>>       the correct TZ?
> 
>   [geo at boxen ~]$ zdump -v /etc/localtime
>   /etc/localtime  -9223372036854775808 = NULL
>   /etc/localtime  -9223372036854689408 = NULL
>   /etc/localtime  Sun Nov 18 17:59:59 1883 UTC = Sun Nov 18 12:09:23
> 1883 LMT isdst=0 gmtoff=-21036
> 
> <one hell of a long list snipped>
> 
>   /etc/localtime  Sun Nov  1 06:59:59 2499 UTC = Sun Nov  1 01:59:59
> 2499 CDT isdst=1 gmtoff=-18000
>   /etc/localtime  Sun Nov  1 07:00:00 2499 UTC = Sun Nov  1 01:00:00
> 2499 CST isdst=0 gmtoff=-21600
>   /etc/localtime  9223372036854689407 = NULL
>   /etc/localtime  9223372036854775807 = NULL
> 
>   [geo at boxen ~]$ zdump -v CDT /etc/localtime
>   CDT             -9223372036854775808 = NULL
>   CDT             -9223372036854689408 = NULL
>   CDT             9223372036854689407 = NULL
>   CDT             9223372036854775807 = NULL
>   /etc/localtime  -9223372036854775808 = NULL
>   /etc/localtime  -9223372036854689408 = NULL
>   /etc/localtime  Sun Nov 18 17:59:59 1883 UTC = Sun Nov 18 12:09:23
> 1883 LMT isdst=0 gmtoff=-21036
>   /etc/localtime  Sun Nov 18 18:00:00 1883 UTC = Sun Nov 18 12:00:00
> 1883 CST isdst=0 gmtoff=-21600
>   /etc/localtime  Sun Mar 31 07:59:59 1918 UTC = Sun Mar 31 01:59:59
> 1918 CST isdst=0 gmtoff=-21600
> 
> <similar hell of a long list like above>
> 
>   /etc/localtime  Sun Nov  1 06:59:59 2499 UTC = Sun Nov  1 01:59:59
> 2499 CDT isdst=1 gmtoff=-18000
>   /etc/localtime  Sun Nov  1 07:00:00 2499 UTC = Sun Nov  1 01:00:00
> 2499 CST isdst=0 gmtoff=-21600
>   /etc/localtime  9223372036854689407 = NULL
>   /etc/localtime  9223372036854775807 = NULL
> 
>   [geo at boxen ~]$ zdump -v CDT
>   CDT  -9223372036854775808 = NULL
>   CDT  -9223372036854689408 = NULL
>   CDT  9223372036854689407 = NULL
>   CDT  9223372036854775807 = NULL
> 
> so, yes. i am in 'central time zone' observing 'daylight savings time'.
> 
> 

Edit the file:

/etc/sysconfig/clock

make sure to set:

ZONE="America/Chicago"


then copy /usr/share/zoneinfo/America/Chicago to /etc/localtime

Run the time tool and make sure that "System clock uses UTC" is NOT checked


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