Time

A Few Facts Concerning GMT, UT, and the RGO - Explains the differences between several time systems.
http://www.apparent-wind.com/gmt-explained.html

Time FAQ - Frequently Asked Questions about time (from sci.astro news group)
http://www.faqs.org/faqs/astronomy/faq/part3/

This Day In History - Today in history every day - often with pictures and sound.
http://www.history.com/this-day-in-history.do

Infoplease: Daylight Saving Time - Information and history about Daylight Saving Time all over the world.
http://www.infoplease.com/spot/daylight1.html

International Standard Date and Time Notation - An overview of the ISO 8601 notation for dates.
http://www.cl.cam.ac.uk/~mgk25/iso-time.html

United States Code - Weights, measures and standard time.
http://tycho.usno.navy.mil/260.html

English Calendar - Includes an ecclesiastical calendar and a section on old and new style dating.
http://www.albion.edu/english/calendar/

A History of Time - Explains the importance of concept of time in the history of mathematics, science and measurement.
http://www-history.mcs.st-andrews.ac.uk/HistTopics/Time_1.html

NIST Time and Frequency Division - The National Institute of Standards and Technology maintains time and frequency standards for the United States.
http://tf.nist.gov/

A Brief History of Time - Early origins and historical perspectives of time measurement.
http://www.perseus.tufts.edu/GreekScience/Students/Chris/TIME2.html

Time - Provides descriptions of several standards of time.
http://scienceworld.wolfram.com/astronomy/Time.html

Calendar Zone - A categorized collection of calendar related sites.
http://www.calendarzone.com/

Calendar Studies - Information about calendar history and calendar reform.
http://www.hermetic.ch/cal_stud.htm

Time Zone and Daylight Saving Time Data - A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.
http://www.twinsun.com/tz/tz-link.htm

Wikipedia: Time - 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.
http://en.wikipedia.org/wiki/Time

Internet Encyclopedia of Philosophy: Time - 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.
http://www.iep.utm.edu/t/time.htm

U.S. Time Zones - History of standard time in the U.S.
http://aa.usno.navy.mil/faq/docs/us_tzones

Z-Time - Article on the time at 0 degrees longitude. Covers the timezone origin, GMT, UTC, GCT, ZULU and JIG.
http://www.maybeck.com/ztime/

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" 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]
http://www.npr.org/templates/story/story.php?storyId=4572036

A Walk Through Time - Evolution of timekeeping through the centuries.
http://physics.nist.gov/GenInt/Time/time.html