icalendar--date-to-isodate
icalendar--date-to-isodate is a compiled Lisp function in `icalendar.el
'.
(icalendar--date-to-isodate DATE &optional DAY-SHIFT)
Convert DATE to iso-style date.
DATE must be a list of the form (month day year).
If DAY-SHIFT is non-nil, the result is shifted by DAY-SHIFT days.