The 3,034 days refers to how many sols (Martian days) it has lasted. The discrepancy is due to the fact that a Martian day is roughly 24 hours 40 minutes long.

The 3,034 days refers to how many sols (Martian days) it has lasted. The discrepancy is due to the fact that a Martian day is roughly 24 hours 40 minutes long. That extra 40 minutes over roughly 3000 days leads to the 82 day difference.