Why do this the wrong way when you can do it the right way? Setting DB location to testlab and changing date leaves the RMX date unsynchronized with the Platform, the Assistant, and CSTA. Set the time correct in the Platform (host OS) and the correct time everywhere else will follow.
The 4K should really have a functioning NTP connection. But you can work around it with setting time on the platform for short periods, it should only be a temporary thing.