A watch featuring a complete calendar or an annual calendar displays the day of the week, the date and the month but not the bisextile years. The watch needs to be adjusted once a year.
Watches featuring a moonphase complication display new moons, first quarters, full moons and last quarters.
A day date watch displays the days of the week (from monday to sunday) and the date (between 1 and 31).
The date is a small window on the dial which indicates the day of the month (between 1 and 31).
The central second is the central hand of the dial which divides the minute into 60 units.