icalendar-export-file
icalendar-export-file is an interactive autoloaded compiled Lisp function in `icalendar.el
'.
(icalendar-export-file DIARY-FILENAME ICAL-FILENAME)
Export diary file to iCalendar format.
All diary entries in the file DIARY-FILENAME are converted to iCalendar
format. The result is appended to the file ICAL-FILENAME.