A Walk Through Time
Evolution of timekeeping through the centuries.
Atomic Clock Time
Displayed in a variety of useful formats. Site is a front-end to U.S. government atomic clocks.
Information about calendar history and calendar reform.
A categorized collection of calendar related sites.
Provides descriptions, proofs and computer programming implementation examples to convert dates to various calendar dates for Julian, Gregorian, and Rata Die calendars.
Includes an ecclesiastical calendar and a section on old and new style dating.
NIST Time and Frequency Division
The National Institute of Standards and Technology maintains time and frequency standards for the United States.
NPR : 'Seize the Daylight': A History of Clock Chaos
Benjamin Franklin first called for the government to tinker with clock hours in the 1780s. But it wasn't until World War I that the United States adopted daylight-saving time as a way to get more efficiency out of the day. "Seize the Daylight"
Summarizes the history of various calendars developed and used over the centuries.
This Day In History
Today in history every day - often with pictures and sound.
Provides descriptions of several standards of time.
Frequently Asked Questions about time (from sci.astro news group)
To set your watch or clock accurately using a time reference. Explains the various options for residents of North America.
Today's Calendar and Clock Page
Information on all things relating to calendars, dates, holidays, and time. Find today's date on several different cultural and religious calendars. Includes section on Celestial data, countdown clocks, and information on the dates past events.
United States Code
Weights, measures and standard time.