Emacs Time-Zones

2 weeks ago 1

October 19, 2025

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 needed to get this done.

With that, I give you M-x time-zones (now on GitHub).

There isn't much to talk about other than time-zones accomplishes the above tasks very easily without resorting to writing elisp nor accessing via customize, which I seldom use.

As I mentioned, time-zones is on GitHub if you'd like to give it a spin. It's super fresh, so please report any issues. Hope you like it.