icalendar--datestring-to-isodate

icalendar--datestring-to-isodate is a compiled Lisp function in `icalendar.el'.

(icalendar--datestring-to-isodate DATESTRING &optional DAY-SHIFT)

Convert diary-style DATESTRING to iso-style date.
If DAY-SHIFT is non-nil, the result is shifted by DAY-SHIFT days
-- DAY-SHIFT must be either nil or an integer. This function
tries to figure the date style from DATESTRING itself. If that
is not possible it uses the current calendar date style.