In a virtualised environment the time can travel quite dramatically based on processor activity and due to the lack of a hardware clock. Whilst the Windows time synchronisation feature is useful, the polls are often too far apart which is why the clock may be presenting incorrectly when you login the following day, as the time has traveled since the last synchronisation poll. We recommend installing AtomTime Pro (http://www.atomtime.com/) which will constantly keep the clock under control for you.