Time - Displayed in a variety of useful formats.
Site is a front-end to U.S. government atomic clocks.
Calendar Zone - A categorized collection of calendar related sites. NIST Time and Frequency Division - The National Institute of Standards and Technology maintains time and frequency standards for the United States. Time References - To set your watch or clock accurately using a time reference. Explains the various options for residents of North America. Time Data - A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.