Option Explicit
Sub CopieDate()
Dim lastrowB&, lastrowA&
With Worksheets("Saisies")
lastrowA = Range(.[A:A].Find("*", , , , xlByRows, xlPrevious).Address(0, 0)).Row
lastrowB = Range(.[B:B].Find("*", , , , xlByRows, xlPrevious).Address(0, 0)).Row + 1
.Range("B" & lastrowA & ":B" & lastrowB) = .Range("A" & lastrowA & ":A" & lastrowB).Value
End With
End Sub