I use this for the previous month, what would I use for the month before last month?
AND(IFERROR(MONTH(@cell), 0) = MONTH(DATE(YEAR(TODAY()), MONTH(TODAY()), 1) - 1), IFERROR(YEAR(@cell), 0) = YEAR(DATE(YEAR(TODAY()), MONTH(TODAY()), 1) - 1)))
Thank you.