You can export data from a Diary to PDF format by using the Diary Reports Feature.

1. Log in as the Diary owner/admin, (or their Buddy if they are not admin of their own Diary)
2. Go to the Diary you want to report on
3. In the top sub-menu Click the Reports feature 
4. Select the date range you want to report on
5. Click the ‘Include logs’ section to select which sections of the Diary you want to report on
6. Click ‘Create’
When the report is ready the ‘Download’ link will appear
7. Click the link to open the PDF

Note: You can also report on user Diaries via the insights area Reports section in XLS format