If you collaborate with people all over the world, it is very useful to add more clocks to Windows 7 and Windows 8, so that you can quickly view the time in other parts of the world. Luckily, Windows makes it easy to add additional clocks to the notification area of the taskbar, on the Desktop. Here's how it works:
How to Add Two More Clocks to the Notification Area
On the Desktop look for the notification area on the taskbar. Usually, it is found on the bottom-left side of the screen, where the current time and date are displayed. Right click or press and hold the time.
A contextual menu is shown with options related to customizing the taskbar and other items. Click or tap "Adjust date/time".
The Date and Time window is displayed. Click or tap the Additional Clocks tab.
There you see two check-boxes with the text "Show this clock". To enable an additional clock, check the first box. To enable the second additional clock, check the second box.
Now you can select the timezone and enter a display name for each clock. For the first clock, click or tap the "Select time zone" drop down list. Then, select the timezone you want to use.
Next, enter the name you want to use for that clock, in the "Enter display name" field.
Repeat the process for the second clock, in case you want to use it. The end result should look similar to the screen below.
To apply your settings, click or tap OK.
How to View the Additional Clocks on the Taskbar
To view the additional clocks you added, look at the notification area on the taskbar, in the area where the date and time are displayed.
If you move your cursor and hover it on top of the clock, the additional clocks are shown in a small tooltip.
If you click or tap the clock, a small window is displayed, showing the calendar and clocks for each time zone that was set.
The first and biggest clock, is for the local time. The smaller clocks are for the time zones you have set.
Every time I configure a Windows 7 or Windows 8 installation, I always add additional clocks, so that I can easily view the time in different countries and areas, where most of my collaborators live. It saves me the pain of converting the time manually. I easily know when to call them, expect them to be online, etc.