[virusdoc]

I have a dual boot 10v, running Snow Leopard and Windows 7 ultimate. Each time I boot into Snow Leopard, it changes the system BIOS time to Greenwich Mean Time (5 hours ahead of my local). The change is made at the BIOS level, although Snow Leopard still reads the correct local time, Windows 7 reads this BIOS time and displays it as if it were current. I find it surprising that Snow Leopard can reset the system time at all, since it was my understanding OS X could not interact with BIOS. Any ideas how to keep OS X from doing this?

Thanks!

-virusdoc

P.S. I did search and found a slightly related thread in the mini 9 forum, but I cannot find any mention of the OS X install actually changing the BIOS time.

related thread:

System time resets after switch boot options. Dual boot W7/OSX

[w7ox]

I'm running only OS X and the BIOS likes GMT, it seems. But in OS X the time displayed is correct for the time zone I'm in. So I'm good with it.

Phil

[Side.Step.Society]

This is a problem with all dual boot systems because of how the different OS's store time. This worked on my Mac mini with Windows 7 and SL.

Run > RegEdit

Find;
HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > TimeZoneInformation

Add key ( REG_DWORD type );
RealTimeIsUniversal

Double-click and set value to 1
and
If your clock is constantly out of sync even though it says the sync was successful, the problem could be that your computer is losing time because of a system clock problem. A workaround in this instance is to change the NTP client to update more often.
Open regedit.exe through the start menu search box, and then find this registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\w32time\TimeProviders\NtpClient
Double-click on the key on the right-hand side for SpecialPollInterval
The default time period is 7 days calculated in seconds. If you wanted to change this to update every day, you would use 86400, or 60 seconds * 60 minutes * 24 hours * 1 day.

[mattyparanoid]

...and is due to the way the two operating systems define system time. Windows based systems treat the system time as local. OSX treats system time as GMT.

It was driving me crazy until found the answer for myself. I was sure something was broken...

Cheers.

M

[virusdoc]

Originally Posted by Side.Step.Society

This is a problem with all dual boot systems because of how the different OS's store time. This worked on my Mac mini with Windows 7 and SL.

Run > RegEdit

Find;
HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > TimeZoneInformation

Add key ( REG_DWORD type );
RealTimeIsUniversal

Double-click and set value to 1
and
If your clock is constantly out of sync even though it says the sync was successful, the problem could be that your computer is losing time because of a system clock problem. A workaround in this instance is to change the NTP client to update more often.
Open regedit.exe through the start menu search box, and then find this registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\w32time\TimeProviders\NtpClient
Double-click on the key on the right-hand side for SpecialPollInterval
The default time period is 7 days calculated in seconds. If you wanted to change this to update every day, you would use 86400, or 60 seconds * 60 minutes * 24 hours * 1 day.

Thanks much. This worked. I apologize for not replying sooner--I thought I was subscribed to the thread, but was not.

-virusdoc

[canada eh]

I have the same problem on my genuine mac using bootcamp the time is always messed up after switching.

[w7ox]

Originally Posted by canada eh

I have the same problem on my genuine mac using bootcamp the time is always messed up after switching.

Hmmm .. No problem with Parallels running Windows on my MacBook. But with a virtual machine it's a different situation.

Phil

[Side.Step.Society]

Originally Posted by canada eh

I have the same problem on my genuine mac using bootcamp the time is always messed up after switching.

Try the solution I posted above.

[0212353]

Originally Posted by Side.Step.Society

This is a problem with all dual boot systems because of how the different OS's store time. This worked on my Mac mini with Windows 7 and SL.

Run > RegEdit

Find;
HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > TimeZoneInformation

Add key ( REG_DWORD type );
RealTimeIsUniversal

Double-click and set value to 1

Did this not work for anyone here?

I am running SL and 7 Ultimate on my 10v. Tried this, didn't work.

[Side.Step.Society]

It may take a few reboots/switches between OS's to work, but as of right now, it's working on both my Mac mini and my 10v.