Information about calendar history and calendar reform.

A categorized collection of calendar related sites.

Writing about time: psychology, physics, philosophy and measurements of time.

Explains the differences between several time systems.

Explains the importance of concept of time in the history of mathematics, science and measurement.

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

An overview of the ISO 8601 notation for dates.

Time has been studied for thousands of years. Nevertheless, many issues remain to be resolved. This article explores both what is now known about time and what is controversial and unresolved.

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 USA 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 shares an excerpt from his book. [4:54 streaming audio broadcast]

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)

Evolution of timekeeping through the centuries.

Time is a common term for the experience of duration, and a fundamental quantity of measuring systems. Article explains time definitions, history of measurements, perceptions in religion, philosophy and science.

Article on the time at 0 degrees longitude. Covers the timezone origin, GMT, UTC, GCT, ZULU and JIG.