GOT IT!!!
Sub unhide()
'hides columns based on value in cell C3 (month)
Dim iMonth As Long
Dim iStart As Long
Dim iStop As Long
iMonth = Range("C3").Value
iStart = (4 + iMonth)
iStop = 15
'ensures all columns unhidden to start
Columns("C:P").Select
Selection.EntireColumn.Hidden = False
'once we get to 12, all columns are now unhidden, so don't need code to hide
If iMonth = 12 Then
Columns("C:P").Select
Selection.EntireColumn.Hidden = False
Else
'if <12, then hides unneeded columns
Range(Columns(iStart), Columns(iStop)).Select
Selection.EntireColumn.Hidden = True
End If
Range("C3").Select
End Sub
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