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The perpetual calendar complication displays the day, date and month, but it requires less adjustment than an annual calendar. This complication knows the number of days in each month but it also knows the year so that it will automatically adjust for leap year. The next time a perpetual calendar will have to be adjusted is in the year 2100.
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.
