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:
- When it’s 4pm in New York, what time will it be in Tokyo?
- How many hours of overlap are there between working days in New York and Hong Kong?
- Which cities’ offices are currently open?
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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
- No way to add/delete cities from the front end (the set shown are based on colleagues’ working locations and home cities)
- The linear 24-hour dials do not display if they would include a DST change. However as far as I am aware, these only occur at weekends