system time shifted on every boot

[*MiK]

Since i've installed osx on my dual boot system, when i start osx the time is shifted one hour up, and the same when i start windows...

any ideas to fix this?

Thanks

[Tyrone Shoe]

One of two possibilities:

1. 1) You have different timezone settings on each system and it's computing it off GMT
   
2. 2) You are on a laptop with speedstep and you're starting the laptop off battery power:
   1. 
      
   2. There is not good speedstep support in the kernel yet (particularly for SSE2 CPUs)
      
   3. If you start your laptop off battery, it initially boots in a low power CPU mode where the system clock is lowered. On my 1.7Ghz Dothan, it boots at 600Mhz if I'm on battery.
      
   4. Because it boots in a low power speedstep mode, the kernel thinks it's on a retardedly slow machine and adjusts the RTC and other stuff incorrectly. When this happens, the net effect is that you clock runs about half as fast as real time and after an hour, your clock is going to be 30 minutes slow. After 2 hours, it's an hour off, etc. etc.
      

Solution?

The solution for 1 is probably really easy. Just check your timezone stuff in OSX and Vista.

 

The solution for 2 is to turn off speedstep in your BIOS and wait till the Paulicat speedstep stuff is integrated into the SSE2 kernel.

 

Note:

If I'm off the mark, it's because you didn't give any system info. You should make sure to include some specs on your system when posting something like this.

 

Hope that helps!

[*MiK]

[*]1) You have different timezone settings on each system and it's computing it off GMT

 

I've checked the timezone, and it is the same on both windows and osx

 

[*]2) You are on a laptop with speedstep and you're starting the laptop off battery power:

[*]There is not good speedstep support in the kernel yet (particularly for SSE2 CPUs)

 

 

The solution for 2 is to turn off speedstep in your BIOS and wait till the Paulicat speedstep stuff is integrated into the SSE2 kernel.

 

My system is window xp/osx (not laptop); on asus p5b e intel core 2 duo e6400; in the bios the speedstep was already disabled.

 

I've tryed to uncheck in xp the "legal hour" option, but this does not resolved the issue:

 

i still get the clock one hour back when going to xp, and one hour in advance on osx...

[Korrupted]

Try putting this in your startup folder[X:\Documents and Settings\YOURUSERNAMEHERE\Start Menu\Programs\Startup, where X is your drive letter, and YOURUSERNAMEHERE is your user name.] for XP. It's Apple's EXE which will auto correct the time[Just keep Mac and Windows both on your regular timezone]. Feel free to virus scan it, but I use it daily on my system when I have to reboot, so it's clean on my end.

AppleTime.exe

[*MiK]

Try putting this in your startup folder[X:\Documents and Settings\YOURUSERNAMEHERE\Start Menu\Programs\Startup, where X is your drive letter, and YOURUSERNAMEHERE is your user name.] for XP. It's Apple's EXE which will auto correct the time[Just keep Mac and Windows both on your regular timezone]. Feel free to virus scan it, but I use it daily on my system when I have to reboot, so it's clean on my end.

 

So you have experienced this issue, too?

Now i try on xp this util..

thanks

 

 

 

 

I've tried it on xp, but requires an active internet connection on system startup; maybe a solution can be to set the timezone on osx shifted of one hour?

Edited March 8, 2007 by *MiK

[Korrupted]

If you have broadband Internet, shouldn't you always be connected anyway?

[cbmkgd]

Another trick is to chose "London" as the TimeZone in OSX (or "Ponta Delgada" a little bit westward when in daylight saving time).

 

Still another trick is to simulate using local time on osx, from this wiki tip&trick.

[loonymonkey]

Is there any negatives to using this fix on the wiki?

 

Much Easier Alternative

 

• Create a file in Notepad with the following contents:
  

Windows Registry Editor Version 5.00

 

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]

"RealTimeIsUniversal"=dword:00000001

Save it as "Timefix.reg", then double-click on the file to merge it with the registry. Windows will now calculate hardware time based on GMT. Mac OS X does this by default, so your clocks will stay in synch.

[Bra$$eN]

I have this same issue with my XP... It got shifted over 3 hours...

 

I solved it by enabling "Set date & time automatically" in the clock menu in Mac OS...

 

 

Not sure if you guys tried it, but works for me. Also, I have disabled the time auto update feature in win XP...

 

cheers

[siegfried_seb]

Yes. Using London Time as default. I'm using it.