World Clock Deluxe comes with over 200 time zones (e.g. Eastern Standard Time, Pacific Daylight Time) and world times (e.g. Greenwich Mean Time, Coordinated Universal Time) that you can assign to your clocks.
Make World Clock Deluxe active and choose View > Cities & Time Zones.
Click any clock in the palette and choose Cities & Time Zones from the pop-up menu.
Click the World Clock Deluxe status menu icon or clock and choose Cities & Time Zones.
Press and hold the World Clock Deluxe icon in the Dock and choose Cities & Time Zones from the pop-up menu.