This what I have, but I need the person running to be able to input the newest date in place of the highlighted portion:
LastRow = Range("B" & Rows.Count).End(xlUp).Row
Range("F2:F" & Range("F" & Rows.Count).End(xlUp).Row).Formula = "=IF(ISNA(VLOOKUP(C2,'12-31 TO 01-06'!$C$1:$F$500,4,FALSE)),""NONE"",VLOOKUP(C2,'01-07 TO 01-13'!$C$1:$F$500,4,FALSE))"
Range("F2").AutoFill Destination:=Range("F2:F" & LastRow)
For Q = 1 To Cells(Rows.Count, "F").End(xlUp).Row
If Cells(Q, "F").Value = "NONE" Then Cells(Q, "F").Interior.ColorIndex = 15
Next
LastRow = Range("B" & Rows.Count).End(xlUp).Row
Range("F2:F" & Range("F" & Rows.Count).End(xlUp).Row).Formula = "=IF(ISNA(VLOOKUP(C2,'12-31 TO 01-06'!$C$1:$F$500,4,FALSE)),""NONE"",VLOOKUP(C2,'01-07 TO 01-13'!$C$1:$F$500,4,FALSE))"
Range("F2").AutoFill Destination:=Range("F2:F" & LastRow)
For Q = 1 To Cells(Rows.Count, "F").End(xlUp).Row
If Cells(Q, "F").Value = "NONE" Then Cells(Q, "F").Interior.ColorIndex = 15
Next