When a calendar is exported, the activities scheduled after 19:00 hours are moved to the next day, the event is also for the whole day.

Steps to Replicate:
1. Create a course
2. Create an assignment, set due date to time greater than 19:00.
3. Add the calendar block to the course
4. Log in as a student and download the calendar using Ical
5. Compare the Moodle calendar and schedule exported