Understaning how many months a loan has left in tapes

Good morning fellow BP investors, I recently started getting tapes with no column that shows the amount of months left for the loan, a crucial bit of information.

If i take the next due date and the maturity date and subtract the two, will that always give me the correct amount of months left? I think it is but i wanna make sure I am not missing anything or there is some condition in which this does not apply.