The permanent URL of this site is http://24hourtime.info.

What's strange about these clocks and watches? And why are there 24 hours in a day but only 12 hours on a typical dial?






They've all got 24 hour analog dials: the hour hand goes round once a day, not twice a day. The minute and second hands operate as usual.

This site is dedicated to the unusual character of the 24 hour analog clock (and watch) face.

The watch from Think the Earth illustrates the logic behind the design: it helps you understand the nature of time more clearly.


The dial consists of a model of the Northern Hemisphere of the Earth, which rotates once a day, just like the hour hands of all the watches and clocks listed on these pages.

Browse this site if you want to see these and other watches and clocks that show all the 24 hours of the day.


alain silberstein

This picture of an Alain Silberstein watch is borrowed from André’s site. It's the definitive 24 hour watch site: he 'always keeps 24 hour watch'. André helped me with the development of this site too.

Think the Earth

Visit the Think The Earth web site to buy their watch, and to find out the thinking and philosophy behind the site.


An interesting site for those of you who love watches is Lost Times. Here you'll find the Think The Earth watch, and, last time I looked, a beautiful Gruen 24 hour piece from the 1960s.

And if you've arrived straight at this page from another site, don't forget to explore the other pages of this site, including the list of most of the 24 hour analog watches and clocks.

Java and web clocks

The Java clock used on this site was written originally by Antony Pranata: I've borrowed his Java source code, and made the 24 hour analog version.

Time and time-keeping

The Long Now Foundation has great ideas.


The clock will tell the time and date for 10000 years, and is intended to remind us of our responsibility to the future.

Time and Art

Try the Nelson-Atkins museum for a Shockwave/Flash travel through time: Tempus Fugit.

General clocks and calendars

Start off by looking at Paul Nagai's page, which has lots of great links. Also try Gordon Uber's site at ubr.com/clocks/.

For something a little more unusual, visit the Almagest site, where you can purchase an almagest, a modern equivalent of the astronomical clock.


Why do clocks go clockwise? Donn knows the answer.

Good books

Want to buy a book about clocks? You will probably find something at Rita Shenton's horological book emporium.

More unusual clocks

If you think 24 hour clocks are odd, try the Horology - The Index site for some more radical alternatives, not just for clocks, but for time-measuring systems.

Some, like the original medieval clockmakers, want to represent the full day as a circle. Others are more interested in how the day is divided, or in moving away from old-fashioned (and Euro-centric) time zones.

For starters, try:

The metric time fans have real clocks and watches, courtesy of the French Revolution and Swatch. Try A guide to metric time.

If you want 9 hour clocks (9 'hours' in a day), look no further than www.stime.com.

And finally

This is a spring-driven striking clock from Italy, about 1730. The 6 hour dial may have been designed to save power when striking the hours. It didn't catch on:


This site is about the 24 hour analog clock. Here you can find out where to buy 24 hour analog clocks and watches, and where to see some of the more famous examples. There’s a History page, which gives some history about them, and a Software page, with links to some software clocks that offer 24 hour analog capability.

Site history

In 199-something, I received a Swatch watch as a birthday present.


It was unusual in that it had a 24 hour analog dial instead of the more usual 12 hour dial. It piqued my interest, but there wasn’t a lot of information to be found in the libraries that I had access to. I also thought it might be interesting to make a 24 hour analog clock.

The internet helped: I tracked down a supplier of 24 hour quartz movements, and I also eventually found André’s 24 hour watch site.

In March 2000, I decided to put together a few pictures I’d found, a bit of historical background, and a hacked Java 24 hour analog clock applet. Thus was born the 24 hour analog clock site. At first, the site lived on CamNet, the community-oriented ISP in Cambridge, which worked well for years. After many months of problems and unavailability, though, I decided to move the site to Apple’s .Mac servers on 2004-01-12, and it lived there until 2009, when I moved over to WordPress and Blogger.

People from all over the world visit this site, and some make helpful or interesting contributions, for which - “thank you”!

1 comment: