Alternative Systems
Calendar Reform, DIME = Decimal Time, Dr. Winstead's Current Local and World Standa, New Earth Time, Omni Time, The New Calendar Reform, Time Cube
Clocks and Watches
Cesium Atomic Clocks, Doug's Atomic Clocks, How Stuff Works: Atomic Clock, How Stuff Works: Pendulum Clock, Smithsonian Institute - On Time
Current Time
American Time Zones, Calculate the Day of the Week, ClockGenius, CNN - World Time, Econofinance World Time Zones Converter, GMT, Human Clock, International Time Offset, Local Times around the World, Official U.S. Time
Horology
"Orologio" at the St. Mark's Square, 24 hour analog clocks, Abbey Clock Clinic - Mark Headrick's Horology, Allan Variance -- Overview by David W. Allan, Antique Horology, Clock a History, Clocks and Time, Cumbria Clock Company, David Knight - Watchmaker from UK, Daylight Saving Time
A Few Facts Concerning GMT, UT, and the RGO
Explains the differences between several time systems.
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.
Calendar Studies
Information about calendar history and calendar reform.
Calendar: A History
The history of the western calendar and the clock.
Date Algorithms
Provides descriptions, proofs and computer programming implementation examples to convert dates to various calendar dates for Julian, Gregorian, and Rata Die calendars.
English Calendar
Includes an ecclesiastical calendar and a section on old and new style dating.
Infoplease: Daylight Saving Time
Information and history about Daylight Saving Time all over the world.
International Standard Date and Time Notation
An overview of the ISO 8601 notation for dates.
Light of Day
Shedding light on Queensland's daylight saving opposition.
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
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" Author David Prerau talks about the complicated politics and curious history of DST, and he shares an excerpt from his book. [4:54 streaming audio broadcast]
The Calendar
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.
Time
Provides descriptions of several standards of time.
Time FAQ
Frequently Asked Questions about time (from sci.astro news group)
Time References
To set your watch or clock accurately using a time reference. Explains the various options for residents of North America.
Time Zone and Daylight Saving Time Data
A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.
When Do You Want To Go Today?
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.