An event is created on Mon 2nd Feb 2015 calendar with 20 repetitions each subsequent Monday.
In April the weekly event when clicked on displays as Sunday instead of Monday but in the date field it is the correct date which is the following day. If the event is saved it changes to the correct day but when the event is reopened the day again shows Sunday.

To reproduce:

1. Set server timezone to Sydney
2. Manually create event on April 6th, 2015
3. After event is created you are redirected to page /calendar/view.php?view=day&time=1428278400#event_1 which shows correct headings and links
4. Browse April in calendar, click on the event, the link is /calendar/view.php?view=day&course=1&time=1428238800#event_1 and the headers and prev/next days links are incorrect