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The USNO websites,,,,, and are undergoing modernization efforts.  The expected completion of the work and the estimated return of service is Summer 2020.

Web-Based Time Synchronization

Web time displays from the USNO Master Clock, Washington, DC

USNO servers provide a wide variety of web-based time synchronization products including embedded web clocks to display UTC(USNO) on other web pages.


USNO Master Clock Time
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