Unscrew the crown, then pull it out to the first click and set the date to yesterday.
Next, pull the crown out to the second click and turn the hands clockwise until the date changes to today - this indicates midnight has passed.
From here, continue setting the correct time. If it’s the afternoon, make sure you move the hands past 12 o’clock once more.
Finally, push the crown back in and screw it down securely to maintain water resistance.