Hi - just wanted to firstly, let you know of a simple web application, http://permatime.com , that we launched a while ago, which relies on the tz database info (via the ruby tzinfo library). Many thanks to the tz database maintainers (and also to ruby's tzinfo maintainers)! Also... I was wondering if anyone had any ideas if there is a public domain source for mapping city names (and single timezone countries) to timezones? We have manually added a few (including European single timezone countries and some prominent Asian cities) as aliases of timezones, but are always getting requests for a more comprehensive set of cities. kind regards Tim FYI: Permatime.com provides a way of representing times as urls, or "permatimes". Imagine you want to announce an event with participants across different time zones. Simply set the time, in your time zone, and permatime.com will generate a link for it. If you share this link with others, they will see that time in their own local time zone (and any other zones they choose). Use a permatime link to arrange a phone call, timestamp a blog post, announce a webinar... Practical permatime examples • http://permatime.com/US/Central/2008-12-04/11:00/37signals_live?link=http://... • http://permatime.com/US/Central/2009-01-12/11:00/Next_teleconference