Open the Calendar application to view events you’ve created or that others have invited you to.
When you first set up your phone, you configured it to use an existing Google Account or you created a new account. The first time you open the Calendar application on your phone, it displays any existing calendar events from your Google Account on the web.
You can add additional accounts with Google Calendar or Microsoft Exchange calendars to your phone, and configure them to display in Calendar.
When you first set up the Calendar application to synchronize events on your phone, it includes events from the previous month through one year in the future. Subsequently, Calendar keeps a year’s worth of future events synchronized between your phone and the web, plus any later events that you add to your calendar using Calendar on your phone.
If you have a lot of entries in your Calendar, you can use the Pinch-to-zoom gesture in Agenda view to compress your calendar entries into task bars to get an overall view. Use the spread gesture to expand your calendar entries to the normal view.