Variable: icalendar-vcalendar-version
icalendar-vcalendar-version is a variable defined in icalendar.el.gz.
Value
"2.0"
Documentation
The current version of the VCALENDAR object, used in the
icalendar-version property. "2.0" is the version corresponding to
RFC5545.
Source Code
;; Defined in /usr/src/emacs/lisp/calendar/icalendar.el.gz