This command will export all smart calendar birthdays to a file
"bbday.txt" in your MyDocs folder.
sqlite3 -header ~/.calendar/calendardb 'select * from components where componenttype = 4' > ~/MyDocs/bbday.txt

The entry in the seventh column is the name of your contact, you may
want to delete this entry before posting your data here. (No need to
paste the full file here, one or two lines should be enough.)

Nicolai