Hello Adriano,
My problem is the notification of an event happing is sent the day after the event. It looks like a time zone calculation issue. The latest example this happened to was this morning. I've attached screen shots of the event, the task log and my email. I have no problem with when the task fires (at 3am) as we don't start events before 6am local time, just with the fact it notified me of an event from the previous day. We are in American/Chicago TZ so the calendar event was scheduled correctly.
Regards,
Mark