Hi Andrea,
Can you try this
Dim dtScadenza as DateTime = oRecINV6.Fields.Item("DueDate").Value
Dim dtDaPagare as DateTime = oRecINV6.Fields.Item("PaidToDate").Value
Dim Scadenza As String = dtScadenza.ToString("yyyyMMdd")
Dim DaPagare As String = dtDaPagare.ToString("yyyyMMdd")
Regards
Edy