Bug 404227 – over-aggressive appointment editor date check (still)
(might be a duplicate, but the more bugs i file, the more probable at least one
of them will be read.) ;-)

evo 2.9.6:
1) new -> appointment
2) change the date from feb 02nd to feb 09th
3) change the time from now to 14:00h
4) change "for" to "until"
5) change feb 09th by highlighting "09" and entering 11.
6) realize that the start date was reset to feb 01.
7) highlight "01" and reenter "09".
8) realize that the end date was reset to feb 09.

this happens in german locale (de_DE.utf8) where the date format is DD.MM.YYYY.