Button A starts and stops the second hand when the crown is pushed in fully. The starting position of the second hand can be changed by pressing Button A repeatedly when the crown is fully extended.
The crown has three positions: in, halfway, and out. When the crown is pressed in fully, the minute hand, hour hand, seconds subdial, and 24 hour subdial are running. When the crown is pulled out halfway the date display can be changed by rotating the crown counterclockwise when the watch is facing up towards you. When the crown is fully extended out, allows the minute hand, hour hand, and 24 hour subdial can be adjusted by rotating the crown. Fully extending the crown also stops the seconds subdial.
Button B resets the second hand to the starting position that was set by button A when the second hand is not in the set starting position.