[iMore.com]

You can easily view the same world clocks on your iPhone right on your Apple Watch.
Have colleagues, friends or family in different time zones? The World Clock app on the Apple Watch lets you keep track of what time it is in different areas throughout the world. You can add certain time zones to your Watch face with complications or view all the time zones you'd like to track with the World Clock app itself.

Full story from the iMore Blog...