- a way of representing times as urls (using the tz database)

Julian Cable julian.cable at
Mon Apr 27 08:37:17 UTC 2009

Hi Tim,

  we use as our source of geographical information. Its not perfect, but like the tz database itself, it’s a community project and you can improve it if its wrong. Each place has a timezone and it can be downloaded and used locally or accessed via restful web services.


-----Original Message-----
From: Tim Diggins (Google) [mailto:tim.diggins at] On Behalf Of Tim Diggins
Sent: 27 April 2009 08:43
To: tz at
Subject: - a way of representing times as urls (using the tz database)

Hi -

just wanted to firstly, let you know of a simple web application, , 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


FYI: provides a way of representing times as urls, or   

Imagine you want to announce an event with participants across different time zones. Simply set the time, in your time zone, and 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
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