Atomic Clock Time - Displayed in a variety of useful formats. Site is a front-end to U.S. government atomic clocks..
The Calendar - Summarizes the history of various calendars developed and used over the centuries..
Calendar Studies - Information about calendar history and calendar reform..
Calendar Zone - A categorized collection of calendar related sites..
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..
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 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].
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..
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..
