If you pulled the crown out to position 2 and turned it in the opposite direction (counterclockwise) when you set the time or moved the hands during a date setting operation, the 24-hour hand stops at the 0:00 position when the time goes past 0:00 AM. If this is the case, pull the crown out to position 1 and turn it to the left until the 24-hour hand matches the time indicated by the hour hand. If, however, the dual time function setting has been made, allow for the time difference when resetting the time.