How to use the world time clock in the Alarms & Clock app in Windows 10

To add a location and compare times from around the world:

1. To launch the app, select Start  and select Alarms & Clock from the app list or type its name into the search box.

2. In the Alarms & Clock app, select Clock, and then New  at the bottom.

3. Type the first few letters of a location, and then select it in the list. If you don't see the one you want, try another location in the same time zone.

4. Select Compare (the two clocks), and then select a time on the slider at the bottom. Select a location on the map to change which place the slider is referring to. 

5. To stop comparing times, select Cancel , or press Esc.