Depending on one's location, a certain timezone will apply. When travelling to another country, the timezone may change, therefore users can rely on specialized applications that will help them view the correct time in several timezones at once.
In other words, they will have the possibility to create a list with all the timezones they are interested in, and the corresponding time will be displayed on their desktop.
This functionality is typically integrated within desktop clocks or time synchronizers in order to complement their default functions.