The Clock tool can be used to determine the current time using the GPS satellites.
When you first open the Clock tool, it shows your device's set time. Once you get a GPS fix, the clock automatically updates to show precise GPS time. To refresh the GPS time, tap the refresh icon in the top-left.
To sync your device’s clock with GPS time:
If you prefer a digital clock, you can switch to it by turning off the 'Analog clock' setting in the Clock tool's settings. This will show a large digital clock on the screen.