Hi, I am trying to apply some conditional formatting to a certain column. Basically, if I type in a date that is greater than 18 months, I want it to turn red. It can stay normal if it's within that 18 month window and not past due.

For instance (everything is within column D),

Cell D4, I enter 2/12/2019 (this should highlight red)
Cell D5, I enter 8/22/2022 (this should stay unchanged/no color)

Please help! By the way, this is in Excel 365.