Help with Excel formula - Countif - Greater Than ,Less Than , Equal to a Range of Dates

Trying to identify how many items have been completed less than 1wk, less than 2wk, On time, greater than 3wk, greater than 2wk and greater than 1 week from its due date (Column P). Trying to use Column T as a reference of when the item was actually closed.



trying to us the countif formula but I do not know how to start it. Any help would be greatly appreciated.

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The output will need to be one number not single cell per row.