Internet :

On-Time Atomic Clock Sync 2.0
Synchronize your PC's clock with internet atomic clock servers
This software is a commercial software. You will be able to download and test On-Time Atomic Clock Sync during a certain period of time, then, if it does what you need, you will have to acquire the full version. The trial version available for download on www.softandco.com has a size of 497 KBytes. For additional information and support request, please contact directly On-Time Atomic Clock Sync publisher.

On-Time Atomic Clock Sync 2.0 was released by Aspire Software on Wednesday 02 August 2006. Its known requirements are : internet connection.
On-Time Atomic Clock Sync will run on Windows 95, Windows 98, Windows Me, Windows 2000 and Windows XP.