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Right, so you do the same calculations in those cases, but, when someone proposes meeting at 3PM, you don't have to do any conversions. Some upside, no downside, unless I've missed something.

OK. So you are traveling and your plane goes at 15:00 (with this hypothetical clock, I would drop the PM stuff). Do you have time for lunch beforehand? Should you try to?

Similarly, you are on holiday and someone tells you a museum is open till 04:30. Can you go to dinner first?

I guess that a main question is what kind of query is more frequent: "What time is it now in X", or "At what time is X where I am now?". I thought the former was way more frequent, but now, I do not know anymore.

Maybe the best thing to do is to drop absolute references altogether. IMO, "Shall we meet in 3 hours" is easier for handling across timezone discussions, and will work equally well for "in a different timezone than the one I am used to".

Of course, your SMS/ping/twitter/email client would have to automatically count down such timers for you.

Your travel examples are indeed more difficult, but I travel much less than I coordinate times across time zones, and I suspect most other people do as well, even if it's something as simple as calling family in another state.

For someone who travels a lot, a single time zone may well be more inconvenient, hard to say.

Times relative to now would work well but could be unwieldy. How do you do it if you're e-mailing or texting? If you want to meet next Monday afternoon, do you say "in 2 days and 5 hours"?

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