Multiple all day events are not displayed correctly

Steps to reproduce:

1. Click on the right top menu
2. Select New event
3. Select start date from : 7-July 2015 05:00
4. Select end date from : 10-July 2015 05:00
5. Check on all day event
6. Save event with a name "test event"

Check on the weekly view
Actual Result: All day events are only displayed in 7-July

Expected result: All day events should be displayed from 7-July to 10 -July

Also have checked on event details page, start/end date is wrong for displaying for all day event.

NOTE: For all day event saved by qtorganizer5-eds, the end date in the event should use the next day date as end date.E.g
        displayed in new event page
 start date: 7-July 2015 05:00
 end date: 7-July 2015 06:00
        saving
 start date: 7-July 2015 05:00
 end date: 8-July 2015 06:00 // if we remain 7-July 2015 06:00 as end date in saving for all day event. sth goes wrong

Plz refer to: https://bugs.launchpad.net/ubuntu-calendar-app/+bug/1437305/comments/6