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Photo of time server This system provides time services through the Network Time Protocol (NTP). It is a Symmetricom S200 installed in August 2012, replacing a Truetime (later Symmetricom) NTS-200 installed in May 2003. The S200 derives the time from Global Positioning System (GPS) satellites.

As long as the server is tracking at least one GPS satellite it will synchronize to the satellite's atomic clock and internally maintain time within microseconds or better. (Time synchronization through NTP is generally within milliseconds.) As long as the server is synchronized with GPS time it is classed a stratum 1 time server. If GPS time is not available it will use another network NTP server as a reference and will be a stratum 2 or higher server.

The time server is available at

Setting the clock on your desktop machine

Most current computer systems include a provision for setting the local clock from an NTP server. Some examples:

For Mac OS X go to System Preferences > Date & Time > Date & Time and check the "set date and time automatically" box and set the server name to Verify that everything is correct and your clock is set. (On older versions of Max OS X go to System Preferences > Date & Time > Network Time and set the server name to Check the "Use a network time server" box. Click the "Set Time Now" button to verify that everything is correct and set your clock.) Also be sure that your time zone is set correctly.

Other Unix and Linux systems have similar features.

For Windows XP an application called Winsync is available to synchronize the clock with the time server. (Windows XP has built-in support for time synchronization, but it isn't compatible with standard time servers.) This hasn't been tested with Windows Vista or later versions.

More information

This page was updated on 2012-09-06. Please direct questions and comments to