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Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
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.
The central second is the central hand of the dial which divides the minute into 60 units.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).