Open the Settings app on your Apple Watch
Tap Clock
Tap +0 min
Turn the Digital Crown to set the time ahead by up to 59 minutes
Tap the checkmark or press the Digital Crown to confirm
To change the time display format, open the Watch app on your iPhone
Tap Clock
Turn 24-Hour Time on or off
To change the watch face time display, press firmly on the watch face
Tap Edit
Adjust the time-related settings available for that watch face
To sync time settings, make sure your Apple Watch is connected to your iPhone and the correct time zone is set on the iPhone