Very clean and polished! I love how smooth the seconds hand move.

I work in an environment where we look at the time across many different timezones around the world. A couple of feature requests if you are ever in the mood:

  1. Make it possible to specify the timezone.
  2. Make it possible to create a grid of clocks, each with different timezones.
  3. Persist the grid/timezone state in the URL so links can be easily shared.