On the Calendar tab, under Time zones, select the Show a second time zone check box and, if needed, the Show a third time zone check box. The second and third time zones are used only to show a second and third time bar in Calendar view, and do not affect the way in which Calendar items are stored or displayed. The time zones can be, for example, your local time zone, the time zone of another business location, and the time zone of a city that you often travel to. In other versions of Outlook, including Outlook 2019 Volume License, Outlook 2016, Outlook 2013, and Outlook 2010 you can display two time zones. In the latest versions of Outlook for Microsoft 365, three separate time zones can be displayed in the Calendar.
