I travel a good amount throughout the year to different time zones. I do not like to change my time in the system tray, but I have found a way to add additional clocks.
Right-click on the time and choose Adjust Date/Time (Figure A).
Figure A. Adjust Date/Time
Click on the Additional Clocks (Figure B) tab and enter the appropriate time zone and display name. For example, I chose to put the time of a vendor that I am traveling to this week. The second clock is the headquarters of my company. You can choose to use this feature any way you like. It comes in very handy.
Figure B. Adding additional clocks
After you apply your configuration, hover your mouse over the time in the system tray to see the additional clocks (Figure C).
Figure C. Additional clocks