The user timezone wasn't respected in the events name.
e.g. for a user with timezone UTC+1,
for an event
from 12/01/2015 00:00:00
to 12/02/2015 00:00:00
The dates in the event name were set to
(2015-11-30 - 2015-12-01)
while it must be
(2015-12-01 - 2015-12-02)
opw-657962