See Bug#81263. Diary's 'iso' dates should use ISO8601 YYYY-MM-DD
format. This change fixes the format used by `diary-insert-entry'.
* lisp/calendar/calendar.el (diary-iso-date-insertion-form): Use
YYYY-MM-DD format (not YYYY/M/D) when inserting ISO dates.
* test/lisp/calendar/diary-icalendar-resources/import-bug-11473.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-bug-22092.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-bug-33277.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-legacy-vars.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-multiple-vcalendars.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-non-recurring-1.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-non-recurring-all-day.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-non-recurring-another-example.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-non-recurring-folded-summary.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-non-recurring-long-summary.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-time-format-12hr-blank.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-with-attachment.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-with-timezone.diary-iso:
* test/lisp/calendar/diary-icalendar-resources/import-with-uid.diary-iso:
Update tests.