Archives Library Information Center (ALIC)


Links to information about time, clocks and calendars.

Calendars - Reference
Links to a wide variety of calendars including Hindu, Ecclesiastical, astronomical, and more, as well as links to information about different kinds of calendars.

Clockworks: From Sundials to the Atomic Second
(Encyclopedia Britannica)
A look at three millennia of timekeeping.

Doomsday Algorithm
This site explains the formula for calculating the day of the week of a given date.

The History of Timekeeping
A history of timekeeping from using the sun to the development of atomic clocks.

Horology - The Index
Horology is the science of measuring time and the art of making timepieces. This site offers links to information about timepieces of all kinds, repair and restoration, collecting, and more.

Local Times Around the World
This site attempts to list all of the countries of the world with their local times.

Official U.S. Time
(National Institute of Standards and Technology and the U.S. Naval Observatory)
These two agencies contribute to world time, or Coordinated Universal Time (UTC), for the U.S. The time is accurate within .1 second.

Perpetual Calendar
This site calculates the day of the week for any date from January 1, 1 B.C. to December 31, 2999. Also included is the formula for determining for figuring out the day of the week for any date.

The Perpetual Calendar
An article by Toke Nørby that discusses the conversion from the Julian calendar to the Gregorian calendar, and provides advice for determining the New Calendar (Gregorian) date for an Old Calendar (Julian) date.

A Rudimentary Treatise on Clocks, Watches and Bells
A digitized version of Baron Edmund Beckett Grimthorpe’s 1903 book on time measurement, chronometers, and bells.

A Walk through Time
(National Institute of Standards and Technology)
This NIST web site explores the evolution of time measurement.

World Time Server
This handy site gives times for locations worldwide. Includes a searchable list of locations by country or city.