The Brooklyn 36 is equipped with a very useful triple calendar complication, also known as complete calendar or full calendar watches (“quantième complet” in French, a complication made popular by the Blancpain’s Villeret collection).
This type of watch displays the date, the day of the month, and the month of the year. It’s akin to having an analog smart watch on your wrist.
In complete/full/triple calendar watches, the date wheel complication reads all months as having 31 days, so on the 31st day at midnight, the date automatically changes to the first of the next month. Moreover, the little pusher at the 2 o’clock adjusts the month while the crown changes the date, day of the week, and time.