You can view individual calendars for your different accounts or a combined calendar for all accounts.
Tap Calendars, then select a calendar. Tap All Calendars to view combined events from all calendars.
You can view your calendar events in a list, by day, or by month. The events for all of your synced calendars appear in the same calendar on iPhone.
Tap List, Day, or Month.
List view: All your appointments and events appear in a scrollable list.
Day view: Scroll up or down to see the events in a day. Tap
or
to see the previous or next day’s events.
Month view: Tap a day to see its events. Tap
or
to see the previous or next month.

Tap the event.
In Settings, choose “Mail, Contacts, Calendars.”
Under Calendars, tap Time Zone Support, then turn Time Zone Support on.
Tap Time Zone and search for a major city in the time zone you want.
When Time Zone Support is on, Calendar displays event dates and times in the time zone of the city you selected. When Time Zone Support is off, Calendar displays events in the time zone of your current location as determined by the network time.