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Re: System time 1 hr ahead of real time



On Mon, Apr 6, 2009 at 9:17 AM, suvayu ali <fatkasuvayu+linux gmail com> wrote:
> Hi Mikkel and Chris,
>
> 2009/4/6 Chris Tyler <chris tylers info>:
>> On Mon, 2009-04-06 at 04:19 -0700, suvayu ali wrote:
>>> Hi all,
>>> The system time on my F10 is showing a time one hr ahead of the real
>>> time, neither does it let me change. What could be wrong?
>>>
>>> $ date
>>> Mon Apr  6 05:17:16 PDT 2009
>>>
>>> --
>>> Suvayu
>>
>> Perhaps your system is set to keep time in UTC, and another system
>> (Linux distro, live disc, Windows) is set to to run the hardware clock
>> in local time, and bumped the time by 1 hour when you booted after the
>> daylight savings time switch?
>>
> I have my hardware clock set to the local time. Yesterday I booted to
> my XP partition first time after the DST change. Looks like that had
> something to do with this.
>
>> >From the Gnome desktop, you can right-click on the clock in the panel
>> bar and select 'Adjust Date and Time';
>>
> I tried changing it from there, but it wouldn't let me change it even
> after entering the root password. It could be that I was doing a typo
> there, as after your reply I changed it from the command line just
> fine with a sudo before date.
>
>> You can also set the time from the command line with the 'date' command
>> (see 'man date'), or get the time from a time server (once) with the
>> command 'rdate -s time.nist.gov' (US server, not responding from here
>> atm) or 'rdate -s time.nrc.ca' (Canadian server). Once the system
>> (software) clock is updated, you can then write the time to the hardware
>> clock with 'hwclock --systohc'.
>>
>> Strong recommendation: turn on NTP (network time protocol) if your
>> network environment is appropriate (i.e., usually connected to the
>> internet and can initiate outbound connections to servers) -- your
>> system will then periodically contact time servers and try to keep your
>> local clock on-track. 'chkconfig ntpd on' should do the trick.
>>
> I have turned ntpd on, thanks for the suggestion.
>
> I have a strong hunch booting to XP after the DST change caused this
> mismatch. What is the recommended way of maintaining the system time
> for dual boot machines?
>
>> -Chris
>>
>
> Thanks  a bunch. :)
> --
> Suvayu

When you use a dual/multi-boot system you need to disable one or more
of your systems from automatically updating for daylight savings. This
goes whether you are booting multiple versions of Windows or a mixture
of Windows and Linux.

The other issue is that you need to patch your Windows software.
Daylight savings began last month.


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