FYI: /etc/localtime and changing to summer time

[antonio montagnani]

Matthew Saltzman wrote/ha scritto, On/il 29/03/2004 01:13:

>
>
>The permission issue referred to elsewhere notwithstanding (I haven't run
>into it), I think what happens is this:
>
>Case 1: The hardware clock is local time.
>
>- Windows: Windows always displays proper local time.  If powered on
>at 2am on time change night, Windows adjusts the system clock and the
>hardware clock.  If powered off at 2am, Windows adjusts both clocks on
>next bootup, so you had better not adjust the hardware clock when booting.
>(I think auto correction can be turned off in the clock config screen.)  I
>think that any attempt to set the system clock in Windows will reset the
>hardware clock as well.
>
>- Linux: /etc/sysconfig/clock has UTC=no.  Then Linux displays the correct
>time before the change.  If powered up at change time, Linux adjusts
>automatically and displays the correct system time.  When next rebooted,
>the correct system time is saved to the hardware clock.  If powered off at
>change time, Linux will assume the local clock is correct, so you had
>better adjust it before booting.  If you do adjust the clock, then the
>first boot of Windows after the change will incorrectly attempt to adjust
>the already adjusted clock (unless disabled).
>
>Case 2: The hardware clock is UTC.
>
>- Linux: /etc/sysconfig/clock contains UTC=yes. System clock will always
>show correct local time no matter what.  Hardware clock will be set to UTC
>on shutdown/reboot.
>
>- Windows: Can't handle a UTC hardware clock unless the Windows timezone
>is GMT with no daylight adjustment.
>
>I don't boot into Windows often, so my current solution is to leave the
>hardware clock in UTC and set the Windows's timezone to GMT with no DST
>adjustment.  I think the only problem with this arrangement is that the
>Windows system doesn't display the correct local time.  So I wear a watch.
>
>  
>
Matthew...tnx for your clear explanations.
I switched to case 2 and bought a new watch!!!  ;-) in case I use Windows 

-- 
 Antonio Montagnani
 =======================================================
 Working with Mozilla 1.6 on Linux Fedora Core 1
 =======================================================
   Utilizzo Mozilla 1.6 su Linux Fedora Core 1
 =======================================================