coming from bootcamp windows back to osx... the clock is off!

Discussion in 'Windows, Linux & Others on the Mac' started by aye5882, Jan 24, 2007.

  1. aye5882 macrumors member

    Jun 13, 2006
    does anyone know how to automatically change the clock back to the right time after being in windows (from bootcamp, not parallels). i need to be in windows to run a couple of programs... but whenver i get back on osx, the time is always 4hrs behind... when i click on the clock setup menu, the time goes back to normal. but its annoying.

    any info is welcomed!
  2. aristobrat macrumors G4

    Oct 14, 2005
  3. SRSound macrumors 6502

    Jun 7, 2005
    I have the same problem - would be curious to see any suggestions (other then going into the date&time preferences panel)
  4. gnasher729 macrumors G5


    Nov 25, 2005
    You might check what time zone MacOS X and Windows think they are in. If they think they are in different time zones (MacOS X thinks it is in New York, Windows thinks it is in Seattle), that might cause problems.
  5. crazzyeddie macrumors 68030


    Dec 7, 2002
    Florida, USA
    The problem probably results from how OS X/Windows store the time in BIOS/EFI... But I haven't found a solution, and I doubt there will be one. If you only use Windows for games or something like that, then time doesn't matter. If you want it to auto-correct itself make sure you turn on the time lookup in both OS X and Windows.
  6. aristobrat macrumors G4

    Oct 14, 2005
    My guess is that each OS changes the hardware clock differently. The way that OS X leaves it isn't read correctly by Windows, and vice-versa.
  7. jeremy.king macrumors 603


    Jul 23, 2002
    Fuquay Varina, NC
    You can hack your registry to increase the frequency of time syncing, so you don't have to do it manually.
  8. SRSound macrumors 6502

    Jun 7, 2005
    nah, im not sure it's worth the effort - i cringe everytime i see the XP boot screen on my cinema display anyway...
  9. topgunn macrumors 65816


    Nov 5, 2004
    Mac OS expects the time in EFI/BIOS to be universal time while Windows expects it to be local time. Basically, Mac OS is adjusting the time for your time zone while Windows thinks that the time shouldn't need to be adjusted, hence the difference.

    The lastest version of Boot Camp (drivers CD) includes a small app that corrects the time when you boot into Windows. I believe it is called Windows Time. You can see it in HKLM->Software->Microsoft->Windows->Current Version->Run.

    I actually have fewer problems with Windows having the correct time than Mac OS. Windows always corrects itself within a few minutes of starting up. Sometimes, on the Mac side, I have to open the Date & Time properties at which point the time corrects itself.

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