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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.
Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).
A day date watch displays the days of the week (from monday to sunday) and the date (between 1 and 31).
Watches featuring an « alarm » can be set in advance to ring at a certain moment. These watches are often used to wake you up in the morning.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.
Worldtime watches indicate on their dial the most important cities of the 24 different time zones worldwide. You can simultaneously tell the time of all these cities.
