Watches featuring a GMT complication (which stands for Greenwich Mean Time) can display a second time zone thanks to an additional hand. They are much appreciated by travelers and airline pilots.
Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
The 24H indicator is often associated with watches displaying several time zones.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).