The calendar in D4H can be exported and utilized in a number of popular calendar tools including Google, Icloud, Outlook and many more.
To export your personal calendar open the [Calendar] page located in the [Planning] tab. Selecting the [Turn On] icon at the bottom of the page will generate a link that can be imported into whichever calendar tool you choose to use.
Remember this is a private iCal link for your D4H calendar and will only show activities you've been requested to attend. Don't share this address with others as they will be able to see all the events and attendee names from your calendar without your password.