To link your CampaignAmp Diary with Google Calendar or Apple iCal:
Head to the top-centre of the Diary and click 'Export Diary'
Choose the Campaign Diary you want to export and generate the export URL
Copy the URL
Google Calendar: Click the arrow in a box on the right of Other Calendars. Select 'Add By URL', paste in the URL and click 'Add Calendar'
Apple iCal: Click 'File' then 'New Calendar Subscription'. Paste the URL into the field then 'Subscribe'
NOTE: Any changes you make in the Campaign Diary will appear in your iCal and/or Google Calendar