World clock

A personal project that I put together while working with people in different parts of the world. Even with a set of digital clocks on my intranet, I found myself spending too much effort on mental arithmetic to work out questions like:


The clock uses linear ‘analogue’ 24-hour dials to make quick comparisons of local times easier. In addition, working hours (nominally 9am – 5pm) are highlighted. Daylight saving time (DST) changes are handled automatically (but see note below). It's intended to monitor a relatively small set of cities and not as a general purpose world clock.

Technologies used

Perl, CSS, PHP, JavaScript (jQuery/AJAX)

Issues and limitations