Windows 7 clock going back one hour randomly while running in Parallels 10 VM...

J

jlilest

Junior Member
I am running Parallels 10 on Max OS X 10.9.4, Windows 7 service pack 1.

The Mac is a Macbook Pro with 2.2 GHz Intel Core i7 8 GB RAM.

The VM is configured to 2 GB RAM 64 bit version.

I have turned off the option to sync the time between the Mac and Windows.
I have disabled the windows internet time set-up.

My current solution is a task that runs every five minutes that starts the windows service to set the time and it then sets the clock.
This does fix the clock after it gets off, but I have an application running that is very sensitive to time errors.

This happened with Parallels 9 too.

Does anyone have any ideas as to what I can try?

The Mac is set to: Charlotte NC, which is eastern US time with daylight saving time.
Windows is set to: Eastern time with the option to automatically change the time for daylight savings.

Please let me know any additional information you may need.
 
jlilest said:
I am running Parallels 10 on Max OS X 10.9.4, Windows 7 service pack 1.

The Mac is a Macbook Pro with 2.2 GHz Intel Core i7 8 GB RAM.

The VM is configured to 2 GB RAM 64 bit version.

I have turned off the option to sync the time between the Mac and Windows.
I have disabled the windows internet time set-up.

My current solution is a task that runs every five minutes that starts the windows service to set the time and it then sets the clock.
This does fix the clock after it gets off, but I have an application running that is very sensitive to time errors.

This happened with Parallels 9 too.

Does anyone have any ideas as to what I can try?

The Mac is set to: Charlotte NC, which is eastern US time with daylight saving time.
Windows is set to: Eastern time with the option to automatically change the time for daylight savings.

Please let me know any additional information you may need.
Click to expand...

I am also having this problem. I'm not sure why it is happening. I am running OS X Mavericks (10.9.4) on a mid 2012 Macbook Air with Parallels 9.0.24251 running 64-bit Windows 7 Professional. I have the time set to not sync in Parallels.
 
It may be a kind of conflict.

I think the simplest solution would be to turn off the option in Windows to adjust the time for daylight savings. If the Parallels VM is set to sync the time from OS X, there shouldn't be any need for Windows to make adjustments.

With regards to the person who set the VM so the time isn't synced from OS X, try enabling that option, as well as disabling Windows' time adjustments.
 
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I would be concerned about having the time zone in effect set wrong by changing the daylight saving time option and what effect it might have on applications.
I have a program that talks to my DVR's and having the time off by an hour, which is what it would in effect be, will cause it to fail.
 
I think I found a significant clue during the fall time change.
Setting the windows clock after windows updates it at 2 am, but before the clock reaches 2 am again results in windows thinking you set the time before the time changed.
For the moment I've adjust the schedule time fix to be daily at 4:15 am daily.
 
and it has once again started.
The time jumps back an hour for a bit and then "fixes" itself.
Time and location sync turned off.
Scheduled time change once a day as mentioned above.

I should mention...
Version 11.2.1
Also I tried turning off daylight savings time and setting the time zone to atlantic time
It still happened.
 
I have been reporting this issue for 4 years. Since updating to Parallels 12 it is noticeably worse -- the time jumps randomly, no longer in one hour increments. I have opened several tickets about this issue over the years, countless phone calls and remote sessions.
I have tried every possible combination of settings, either by experimenting on my own, or with the advice of Parallels support. As far as I can tell, it is a persistent bug, plain and simple.
 
Having the virtual computer sync with the Mac's clock makes it work.

That isn't the configuration I want, but it does seem to work correctly.
 
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