From Microsoft page:
Add a second time zone
Two separate time zones can be displayed in the Calendar. The two time zones can be, for example, your local time zone and the time zone of a city that you often travel to. The second time zone is used only to show a second time bar in Calendar view, and does not affect the way in which Calendar items are stored or displayed.
- Click the File tab.
- Click Options.
- On the Calendar tab, under Time Zones, select the Show a second time zone check box.
- In the Label box, type a name for the additional time zone.
- In the Time zone list, click the time zone that you want to add.
- If you want your computer clock to automatically adjust for daylight saving time (DST) changes, select theAdjust for daylight saving time check box. This option is available only in time zones that use daylight saving time (DST).