Update: New versions of Windows come with functionality to add multiple clocks to the system. Those are then displayed when you hover over the clock in the system tray or click on it. The information below applies therefore only to older versions of Windows such as Windows XP. End
There is no built-in way to display different time zones if you are using one of Microsoft's operating systems. The clock in the system tray will always display the time of the selected time zone.
Users have to rely on third party programs or the Internet to view multiple time zones at once. One of the possibilities is a small Microsoft application that can be used to display the time of various time zones in the Windows system tray.
The application pulls the information directly from the default time zone list of the Windows operating system which means that every time zone in the world is covered by it.
You can select the time zones that you want to display there as well. By default five time zones are displayed: London, Los Angeles, New York, New Delhi and Sydney. The software program makes use of balloon tips to display the time zones which means that balloon tips have to be activated for the program to work properly. The easiest way to enable balloon tips again -- should you have disabled them previously -- is by using Microsoft PowerToys.
It takes one click to display the time of all supported locations. A left-click on the system tray icon will display the time zones. A right-click opens up a context menu with configuration options. This can be used to add and remove time zones from the display which allows you to remove locations that you are not interested in, and add others that you may be interested in.
Microsoft Time Zone uses roughly four Megabytes which is acceptable for users who regularly have to check the time in various time zones.
The program is only compatible with Windows XP and requires the Microsoft .Net Framework 1.1.
If you run an older version of Microsoft Windows, you may find the Microsoft Time Zone application useful as it adds support for displaying the time and date of multiple time zones when it is run.
Users on newer versions of Windows may add more clocks using built-in tools. If you use Windows 10 for instance, you'd do the following to add more clocks:
The clocks you add are then shown when you hover the mouse over the clock displayed on the taskbar.
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