Atomic Clock Time Synchronizer is a useful and handy utility to keep your PC clock accurate. It periodically checks and synchronizes your computer clock with NIST atomic time servers, or synchronizes time between computers. You can customise the list of atomic time servers which it will be used to syncronise your PC clock

Atomic Clock Time Synchronizer Features
Synchronizes time with NIST atomic time servers
Proxy support: Socks4/Socks4A/Socks5/HTTP
Supports SNTP (the Simple Network time protocol)
Supports the TIME protocol
Can synchronize time with any server running SNTP or TIME protocol
Periodically checks and synchronizes time at specific interval
Displays time in either local time or UTC/GMT
Easy to use and configure