Accurist 6W50 Operating Instructions Manual page 16

4. Turn crown anti-clockwise to correct the day.
Turning the crown rapidly anti-clockwise (continuously clicking two or more
times) causes the date to automatically advance rapidly. When stopping the
date, click the crown once to the right or left. When the date is not stopped
manually, it stops automatically after being advanced by 31 days.
5. Push in crown to Position A.
Note: As a result of being equipped with an auto calendar function, it is not nec-
essary to correct the date at the end of each month. However, since the watch
uses 28 days for the month of February, it is necessary to correct the date at the
end of February, but only in leap years.