24 hour analog clocks
The 24 hour analog clock and watch site. History, software, and the places to find clocks with 24 h dials.
http://homepage.mac.com/pete.boardman/24hourclock

Abbey Clock Clinic - Mark Headrick's Horology Page
Traditional horology website with information and mantainance tips. Technical descriptions and troubleshooting of escapements. Grandfather clocks, wall clocks, and watches.
http://www.abbeyclock.com

Allan Variance -- Overview by David W. Allan
Core algorithm of international time scale has multiple metrology applications, from atomic clock frequency characterization to definition of the meter. Equation, explanation and publications.
http://www.allanstime.com/AllanVariance

American Time Zones
Displays a map of the main parts of the United States, showing the time zones and the current local time. Time details for most US cities available.
http://www.americantimezones.com

Antique Horology
The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
http://www.antique-horology.org

Atomic Clock Time
Displayed in a variety of useful formats. Site is a front-end to U.S. government atomic clocks.
http://www.atomictime.net

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

ClockGenius
Shows the time in your preference areas of the world.
http://www.clockgenius.com

Clocks and Time
Horological index for organizations, clock and watch museums, related software, mailing lists and links. Maintained by Gordon T. Uber.
http://www.ubr.com/clocks

Daylight Saving Time
History of daylight saving time and how we use it to save energy.
http://webexhibits.org/daylightsaving

Delphi 32 - Components: Date & Time: Clocks - ISO Week Number (Program Code)
Here's some code that generates the weeknumber for a given date in accordance with ISO standard 8601:1988 (European Standard EN 28601).
http://www.delphi32.com/vcl/3136

DIME = Decimal Time
Shows correlation between decimal and regular time.
http://serg.us/dime

Discussion About the ISO 8601 Standard
About 200 people worldwide, who already use and promote the ISO 8601 Year-Month-Day date format have formed this discussion group. Go here for help and advice, or for general discussion. Message archive can be browsed. If you wish to join in, there are options to participate via the Web-based front-end, or subscribe via email.
http://groups.yahoo.com/group/iso8601

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

Flawed Routers Flood University of Wisconsin Internet Time Server
Report by Dave Plonka on the massive problems caused on the University of Wisconsin network and time servers, due to misconfiguration of NetGear equipment
http://www.cs.wisc.edu/~plonka/netgear-sntp

Geodsoft How-To: NTP Time Synchronization
A tutorial on installing NTP servers on UNIX (OpenBSD and Linux) and Windows to accurately synchronize computer times.
http://geodsoft.com/howto/timesync

GMT
Provides comprehensive information on Greenwich and Time issues, including maps, GMT Converter and resources.
http://wwp.greenwichmeantime.com

Home of the Network Time Protocol
NTP official reference implementation (for Unix and Unix-like OSes, with ports to Microsoft Windows NT, VMS, real-time OSes like VxWorks and QNX). Also jumping-off point to the official NTP documentation and FAQ, community documentation tools (twiki), pool.ntp.org, and related projects.
http://www.ntp.org

Horology.com
Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.
http://www.horology.com

Human Clock
People in various situations holding signs of the time. Accepts photo submissions.
http://www.humanclock.com