VBA Help - Conditonal Formatting dynamic Range Comparing other cell values

[shuterjl]

Good afternoon,

I am working on a macro for tracking training dates and notifying the user when training needs to be scheduled. Currently I have my macro doing the following conditions:
-Determines the last row used in the worksheet to know the range to apply the formats to
-Apply the conditional formatting correctly to each column based on certain criteria's in that column's cells

I am trying to add a QOL (Quality of life) improvement that examines a baseline training course and determines if the refresher course needs to be taken based on a specific timeframe, but not having luck so far. For example, in Column M, we track when a person does Rigging training. However, that training is only good for 3 years. Prior to the 3 year expiration date, the employee needs to take a Rigging Refresher training course which is in Column N. I want to add a routine in my code that looks at the Column M Date and if the user inputted R in the cell for Column N, it changes the cell in Column N to brown if today's date is within 90 days of the date in Column M. I know how to do the conditional formatting but not sure on the If Then Routine to look at each row in Column M and apply the conditional formatting in Column N.

Here is part of the code from my macro.

Sub TrainingConditionalFormatting()
Dim LastRow As Long
Dim IfRange As Range


'Find the last used row in a Column
    With ActiveSheet
        LastRow = .Cells(.Rows.Count, "I").End(xlUp).Row
    End With
    
'Rigging Conditioning
  Range(Cells(4, 13), Cells(LastRow, 13)).Select
    Selection.FormatConditions.Add Type:=xlTextString, String:="R", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .ThemeColor = xlThemeColorAccent1
        .TintAndShade = -0.249946592608417
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlTextString, String:="NR", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .Pattern = xlNone
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlTextString, String:="AR", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .Pattern = xlNone
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlExpression, Formula1:= _
        "=LEN(TRIM(M4))=0"
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .Color = 255
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlTextString, String:="S", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .Color = 65535
        .TintAndShade = 0
    End With
    
'Rigging Refresher Conditioning
  Set IfRange = Range(Cells(4, 13), Cells(LastRow, 13))
  Range(Cells(4, 14), Cells(LastRow, 14)).Select
    Selection.FormatConditions.Add Type:=xlTextString, String:="R", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .ThemeColor = xlThemeColorAccent1
        .TintAndShade = -0.249946592608417
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlTextString, String:="NR", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .Pattern = xlNone
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlTextString, String:="AR", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .Pattern = xlNone
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlExpression, Formula1:= _
        "=LEN(TRIM(N4))=0"
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .Color = 255
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlTextString, String:="S", _
        TextOperator:=xlContains
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .Color = 65535
        .TintAndShade = 0
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlCellValue, Operator:=xlBetween, _
        Formula1:="=$I$1+90", Formula2:="=$I$1"
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .ThemeColor = xlThemeColorAccent2
        .TintAndShade = -0.249946592608417
    End With
    Selection.FormatConditions(1).StopIfTrue = False
    Selection.FormatConditions.Add Type:=xlCellValue, Operator:=xlLess, _
        Formula1:="=$I$1"
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Font
        .ThemeColor = xlThemeColorDark1
        .TintAndShade = 0
    End With
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .Color = 255
        .TintAndShade = 0
    End With

Thanks for any assistance