dfg AtomicTimeSync XP 

The program is a Time Synchronization Utility to synchronize your PC via the internet. It supports the 12 and 24 hours time format as well as all time zones. You can define an individual time offset and it works through Firewalls and proxy servers.
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Emsa Time Synchronizer 

Emsa Time Synchronizer is a very simple but useful time synchronization utility. Users that like simplicity, may indeed like this program. It can continously update time in background and autorun at system startup. Freeware.
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MindIT! 

Talking alarm clock featuring 8 alarms and 8 task schedules, automatic atomic time synchronization, Swatch InternetTime support, holidays and observances reminder with database updatable via Internet, one click access to system tools and features
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