Setting the World Clock
The World clock tab allows you to set up a list of cities to easily check current times in other time zones with a quick glance.
Open the Clock app, then select the World clock tab.
Tap the New City icon
(at the bottom of the screen),
search through the available cities, then tap the one you want.
NOTE
The first time you access the World clock tab, a globe image is displayed in the middle of the screen. Tap it to add the first city to your list.