The Clock app includes a world clock, alarms, a stopwatch, and a timer. You can open the Clock app from the Home screen or from the Control Center by tapping
. Use the menu at the bottom of the screen to choose the feature you want to use or configure.
The Sleep | Wake Up function is active if you set up a sleep schedule in the Health app.
By far, the easiest way to set alarms and timers is to use Siri. Tell Siri to “set an alarm for 8 am,” or “set a timer for 30 minutes.” And you can always ask Siri the time. By default, Siri will respond with the local time, but you can ask her “what time is it in Hong Kong” or any city and she’ll do the calculation for you.