Dim rRange As Range
Dim rDuplicate As Range

Set rRange = ActiveSheet.UsedRange
lFirstRow = rRange.Row
lLastRow = rRange.Rows.Count + rRange.Row - 1
lFirstColumn = rRange.Column
lLastColumn = rRange.Columns.Count + rRange.Column - 1
' New reference to current range (can be truncated)
Set rDuplicate = Range(Cells(lFirstRow, lFirstColumn), _
      Cells(lLastRow, lLastColumn))

Range("E3:E" & Cells(Rows.Count, "F").End(xlUp).Row) = DateSerial(Right(Range("Q1"), 2), 4, 1)