chemin = ThisWorkbook.Path & "\Fichiers\"
With Sheets("xxxx")
derlig = .Range("a" & Rows.Count).End(xlUp).Row
tm = Format(Time, "hh:mm")
For i = 2 to derlig
temp = Format(.Range("a" & i), "dd_mm_yyyy")
nom = "achat le " & temp & " à " & tm
ActiveWorkbook.SaveAs Filename:= chemin & nom & "xls", _
FileFormat:=xlExcel8, CreateBackup:=False
t = Timer + 1: Do Until Timer > t: DoEvents: Loop
Next i
End With