FG Time Sync Utilitaire can help you keep all your computers with the exact current time.

Synchronize clock on your Bureau PC or Notebook, using time server available on TCP/IP networks such as the Internet or LAN. It can work as client or server. The protocol currently supported are time protocol(RFC-868).
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Real freeware, no hidden ad ware or SpyWare programs. No trials or restrictions. No trial period
or restrictions. Small file Taille downloaded in seconds. Easy to uninstall if you don't want to keep it.