Scheduling events in plugin: wrong dates are scheduled for repeated event: Start Dates +1h; wrong EndDates (5.0.0)

[samuelinniger]

Describe the bug
When scheduling events, in "repeated events" mode, the scheduled time in opencast does not correspond to the set time in the Opencast ILIAS plugin:
+1h difference for the Start Dates
Also, wrong EndDates are set: +52 min in the screenshot below.

To Reproduce
Steps to reproduce the behavior:

1. Activate scheduling in the plugin settings
2. Go to the plugin --> click on the button Schedule Event(s)
3. Schedule a repeated events series

Expected behavior
Times set in plugin and scheduled times in opencast are identical

Screenshots

Environment (please complete the following information):
ILIAS version: v7.11 2022-06-29
Plugin version: 5.0.0
Browser: Firefox
Opencast: 11.0.0

Additional information:
+1h difference also occurs in PluginVersion 3.7.5