Explains the differences between several time systems.

Evolution of timekeeping through the centuries.

Displayed in a variety of useful formats. Site is a front-end to U.S. government atomic clocks.

Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion.

A categorized collection of calendar related sites.

Includes an ecclesiastical calendar and a section on old and new style dating.

Information and history about Daylight Saving Time all over the world.

by Markus Kuhn - An introduction to ISO 8601, the YYYY-MM-DD date and the 24-hour time notation, with notes on week numbers and on implementation.

Shedding light on Queensland's daylight saving opposition.

The National Institute of Standards and Technology maintains time and frequency standards for the United States.

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]

Summarizes the history of various calendars developed and used over the centuries.

Highlights one major event in recent times, and provides a short list of past events. Also features special entries about this day in crime, entertainment, literary, war, technology, and automotive history.

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.

A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.

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.

Weights, measures and standard time.