Sub Semainier()
Dim i&
Application.ScreenUpdating = False
For i = 1 To 52
Sheets.Add(after:=Sheets(Sheets.Count)).Name = "SEM_" & i
Sheets("SEM_" & i).[A1] = i
Sheets("SEM_" & i).[A3] = "=(R[-2]C-1)*7+DATE(YEAR(TODAY()),1,5)-WEEKDAY(DATE(YEAR(TODAY()),1,4),2)"
Sheets("SEM_" & i).[A2:G2] = Array("L", "M", "M", "J", "V", "S", "D")
Sheets("SEM_" & i).[B3:G3].FormulaR1C1 = "=RC[-1]+1"
Sheets("SEM_" & i).[A3:G3].NumberFormat = "m/d/yyyy"
Next
End Sub