On my machine, the time is changing always, I don't know why. (if its 3:15 it gets to 3:19), and every time I set it back to right time it change again by an amount of 4 mins.
If they're syncing from the same source there shouldn't be an issue. If this is in a domain the source should be your main DC I would verify they're both syncing to the same source
Turning off ntp will eventually cause the systems to drift too far apart and you'll have problems again.
In the Date and Time window from above, under the Date and Time tab, click the Change time zone... button. Select the new time zone in the Time zone drop-down field and click OK. Click OK on the main Date and Time window to save the time zone change.