You can reschedule date or time for one lesson in timetable.
1. Go to Timetable, select the lesson you want to edit on that day. Then click the Pen on the right.
2. Select the new date and time for the lesson, then save
3. Select "This Lesson Only" or "This and Following Lessons" to apply to the timetable. Then OK.
4. The date of lesson is changed.