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 Zone
A categorized collection of calendar related sites.

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 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]

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.

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