Includes section on Celestial data, countdown clocks, and information on the dates past events. About Daylight Saving Time - History from Benjamin Franklin to the present. U.S. law and practice. Worldwide time change dates. Time - Displayed in a variety of useful formats.
Site is a front-end to U.S. government atomic clocks.
The Calendar - Summarizes the history of various calendars developed and used over the centuries. Calendar Studies - Information about calendar history and calendar reform. 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.