Seems that #55 is still reproducing.
Steps to reproduce:
- Select a period eg. 3 days in Calendar view

Expected results: The Start and End date correspond with the selection the user made.
Actual results: One more day is added to the End date.

Environment: Windows 10, XWiki 12.5.1 with MySQL 8.0 and IE 11, Firefox 94, Edge and Chrome 95, Calendar Application (Pro) 2.10.1