A hand per city
Each hand is a city and points at that city's local time right now. Two hands close together are in nearly the same zone; hands on opposite sides are twelve hours apart.
Every time zone on one 24-hour dial. A hand per city points at its local hour, the shaded half is night and the ring is working hours, so you see who is at work, awake or asleep in one look.
Now
Drag round the dial or along the slider to plan ahead. Every hand moves together.
Working hours 9:00–17:00, sleeping hours 22:00–6:00, local to each city.
The face is one day. Midnight is at the bottom, noon at the top, and the hours run clockwise around the edge, like the sun through a day.