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Track time with the stopwatch in Clock on iPhone
In the Clock app , you can use the stopwatch to measure the duration of an event.
Tap Stopwatch.
To switch between the digital and analog faces, swipe the stopwatch.
Tap Start.
The timing continues even if you open another app or if iPhone goes to sleep.
To record a lap or split, tap Lap.
Tap Stop to record the final time.
Tap Reset to clear the stopwatch.