» A Walk Through Time    An illustrated history of timekeeping from ancient times to the present. A presentation of the National Institute for Standards and Technology Physics Lab.    http://physics.nist.gov/GenInt/Time/

» Congressional Calendars    The calendars for both the House of Representatives and the Senate from the 104th Congress (1995-1996) to the present.    http://www.gpoaccess.gov/calendars/index.html

» Federal Holidays Calendars    Find listings of past, present and future federal government holidays.    http://www.opm.gov/fedhol/index.asp

» GPS Calendar    U.S. National Geodetic Survey provides a calendar that converts a typical calendar day to either the Day of Year or GPS Week number.    http://www.ngs.noaa.gov/CORS/Gpscal.html

» Proclamations Issued by President Bush    Presidential proclamations to celebrate special days, weeks and months.    http://www.whitehouse.gov/news/proclamations/

» The Official U.S. Time    Shows the official time in each time zone. A service provided by the National Institute of Standards and Technology and the U.S. Naval Observatory.    http://www.time.gov/

» Today in History    Events from American history are illustrated by digitized items from the Library of Congress American Memory historic collections.    http://memory.loc.gov/ammem/today/today.html

» When Does Daylight Saving Time Begin and End?    History of daylight saving time and a brief calendar of the time change.    http://aa.usno.navy.mil/faq/docs/daylight_time.php

» World Time Zone Map    Map showing the world's time zones.    http://aa.usno.navy.mil/faq/docs/world_tzones.php