A perpetual calendar is a type of watch feature that automatically adjusts the date display to take into account the varying lengths of the months and leap years. This allows the wearer to never have to manually adjust the date, as the watch will always display the correct date no matter how long the month is or when a leap year occurs. A perpetual calendar watch is an incredibly useful feature for those who want to keep track of the date without having to manually adjust their watches every month.
