Emacs ships with a perfectly functional world clock, available via M-x world-clock. Having said that, there are two things I wish it had: A quick way to interactively add any city (bonus points for fuzzy search). An easy way to shift the time back and forth. As far as I can tell, these are neither available nor possible on the built-in world-clock (please correct me if otherwise), so when my friend across the world recently asked me for the best time to meet, I knew this was the last nudge I ...
