Client and server synchronisation

My network has developed a problem where the date and time have been set forward by one day.

This has caused a conflict between the clients and servers.

Attempts at solving the problem has been temporary as after working for some hours the operations master controller and other domain controllers reset themselves. clients are also forced to re-set the date and time.

What is likely to be wrong?

How is the best way to solve the problem?

Any suggestions?

Malo