How to get the error:
1. Enable incoming email settings for a Calendar List
2. Send a meeting request from outlook to the email id set in step 1.
2.1 Have a recurrence set for the meeting that extends beyond the daylight saving date (By default its set to never end so you can leave it as it is) e.g Meeting 2:00 PM to 4:00 PM Occurs every Thursday
3. The Calendar view shows the new meeting item as 2:00 PM to 3:00 PM
Not sure if this happens to sites where there are no daylight savings.