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I really like the idea of showing the country times. I've been looking into ways to do this, but it isn't trivial. I will definitely keep keep thinking about this. I personally would find it really useful.

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Is it getting-the-data which isn't trivial? You can write a crawler for wikipedia. Each country has their time zones in their entry (nicely formatted which makes it easy for parser to find), with daylight saving information too. Many countries, are, of course spanned across a few time zones, but that shouldn't matter.

The root page for your crawler could be: http://en.wikipedia.org/wiki/List_of_countries_by_population, for instance.

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