Perhaps I'm too stupid or it's just a bit too late, but I guess other users will have the same problems:
For editing the EXIF date there is a calendar. I can change the date in the calender, but cannot see a way to actually choose the date as new date.
To reproduce:
1.) In Browser, select an image file with EXIF info. The preview and the properties will be shown.
2.) Switch to Tab "EXIF" in preview pane.
3.) Select one of the editable EXIF dates, e.g. "Date modified".
4.) Click on the small arrow "V" to open the calendar.
5.) In the calendar, select a different date.
--> Try to use the selected date as new date. There seems to be no way to do so.
B4: Calendar cannot be used for editing EXIF date
Moderators: helmut, XnTriq, xnview