diff --git a/Customers/CustomsAviso.aspx b/Customers/CustomsAviso.aspx
index 819c214..7c32371 100644
--- a/Customers/CustomsAviso.aspx
+++ b/Customers/CustomsAviso.aspx
@@ -105,12 +105,14 @@
                             <div class="col-12" id="container2" style="margin-left:2px;">                                                                     
                                             <asp:Label ID="lbl_von" runat="server" Text="Von:"></asp:Label>                                             
                                             <asp:TextBox id="pickdate1" Type="Date" CssClass="classTarget" requiered="true" runat="server"></asp:TextBox>  
-                                           <!--<asp:RequiredFieldValidator ID="RequiredFieldValidatorvon" runat="server" ErrorMessage="Field required" ControlToValidate="pickdate1" Text="Required" ForeColor="White" Font-Strikeout="False" Font-Underline="False" Font-Overline="False" Font-Bold="True" BackColor="Red"></asp:RequiredFieldValidator>              
+                                    <asp:CustomValidator runat="server" ID="valDateRange_1" ControlToValidate="pickdate1" onservervalidate="valDateRange_1_ServerValidate" ErrorMessage="enter valid date" />   
+                                <!--<asp:RequiredFieldValidator ID="RequiredFieldValidatorvon" runat="server" ErrorMessage="Field required" ControlToValidate="pickdate1" Text="Required" ForeColor="White" Font-Strikeout="False" Font-Underline="False" Font-Overline="False" Font-Bold="True" BackColor="Red"></asp:RequiredFieldValidator>              
                                             <asp:CustomValidator ValidateEmptyText="false" ClientValidationFunction="instantValidation"></asp:CustomValidator>            -->
                                 <asp:Label ID="lbl_bis" runat="server" Text="Bis:"></asp:Label> 
                                            <!-- <asp:RequiredFieldValidator ID="RequiredFieldValidatorbis" ClientValidationFunction="validate" runat="server" ErrorMessage="Field required" ControlToValidate="pickdate2" Text="Required" ForeColor="White" Font-Strikeout="False" Font-Underline="False" Font-Overline="False" Font-Bold="True" BackColor="Red"></asp:RequiredFieldValidator>              -->
                                             <asp:TextBox id="pickdate2" Type="Date" CssClass="classTarget" required="true" runat="server"></asp:TextBox>
-                                         </div>                                      
+                                    <asp:CustomValidator runat="server" ID="valDateRange_2" ControlToValidate="pickdate2" onservervalidate="valDateRange_2_ServerValidate" ErrorMessage="enter valid date" />             
+                            </div>                                      
                              <div id="Abstand"></div>  
                               <hr>
                                 
diff --git a/Customers/CustomsAviso.aspx.vb b/Customers/CustomsAviso.aspx.vb
index 6e1dc88..47a7ffa 100644
--- a/Customers/CustomsAviso.aspx.vb
+++ b/Customers/CustomsAviso.aspx.vb
@@ -16,41 +16,60 @@ Partial Class Kundenbereich_Default
     Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
         Page.UnobtrusiveValidationMode = UnobtrusiveValidationMode.WebForms
         DataBind()
-         tbl_Header_row.TableSection = TableRowSection.TableHeader
+        tbl_Header_row.TableSection = TableRowSection.TableHeader
         ' MsgBox(datebis)
         If (Page.IsPostBack And normaltable.EnableViewState = False) Then
             normaltable.EnableViewState = True
             If rbt_Alle.Checked = True Then
                 lbl_von.Visible = True
                 lbl_bis.Visible = True
-                pickdate1.Visible = True
-                pickdate2.Visible = True
-            ElseIf rbt_Alle_M.Checked = True Then
-                lbl_von.Visible = True
-                lbl_bis.Visible = True
+                valDateRange_1.Enabled = True
+                valDateRange_2.Enabled = True
                 pickdate1.Visible = True
                 pickdate2.Visible = True
             ElseIf rbt_Freig.Checked = True Then
                 lbl_von.Visible = True
                 lbl_bis.Visible = True
-                pickdate1.Visible = True
-                pickdate2.Visible = True
-            ElseIf rbt_Freig_M.Checked = True Then
-                lbl_von.Visible = True
-                lbl_bis.Visible = True
+                valDateRange_1.Enabled = True
+                valDateRange_2.Enabled = True
                 pickdate1.Visible = True
                 pickdate2.Visible = True
             Else
                 lbl_von.Visible = False
                 lbl_bis.Visible = False
+                valDateRange_1.Enabled = False
+                valDateRange_2.Enabled = False
+                pickdate1.Visible = False
+                pickdate2.Visible = False
+            End If
+
+            If rbt_Alle_M.Checked = True Then
+                lbl_von.Visible = True
+                lbl_bis.Visible = True
+                valDateRange_1.Enabled = True
+                valDateRange_2.Enabled = True
+                pickdate1.Visible = True
+                pickdate2.Visible = True
+            ElseIf rbt_Freig_M.Checked = True Then
+                lbl_von.Visible = True
+                lbl_bis.Visible = True
+                valDateRange_1.Enabled = True
+                valDateRange_2.Enabled = True
+                pickdate1.Visible = True
+                pickdate2.Visible = True
+            Else
+                lbl_von.Visible = False
+                lbl_bis.Visible = False
+                valDateRange_1.Enabled = False
+                valDateRange_2.Enabled = False
                 pickdate1.Visible = False
                 pickdate2.Visible = False
             End If
 
             datevon = Date.Parse(pickdate1.Text)
             datebis = Date.Parse(pickdate2.Text)
-        Else
-            normaltable.EnableViewState = True
+            Else
+                normaltable.EnableViewState = True
             Dim erster = New Date(Now().Year, Now().Month, 1)
             Dim ersterdat = erster.Day.ToString + "." + Now().Month.ToString + "." + Now().Year.ToString
             pickdate1.Text = erster.Day.ToString + "." + Now().Month.ToString + "." + Now().Year.ToString
@@ -459,5 +478,22 @@ Partial Class Kundenbereich_Default
             pickdate2.BorderStyle = BorderStyle.None
         End If
     End Sub
+    Protected Sub valDateRange_1_ServerValidate(source As Object, args As ServerValidateEventArgs)
+        Dim minDate As DateTime = DateTime.Parse("01.04.2001")
+        Dim maxDate As DateTime = DateTime.Parse(DateTime.Now.ToShortDateString)
+        Dim dt As DateTime
 
+        args.IsValid = (DateTime.TryParse(args.Value, dt) AndAlso
+                     dt <= maxDate AndAlso
+                     dt >= minDate)
+    End Sub
+    Protected Sub valDateRange_2_ServerValidate(source As Object, args As ServerValidateEventArgs)
+        Dim minDate As DateTime = DateTime.Parse("01." + Date.Now.Month.ToString + ".2001")
+        Dim maxDate As DateTime = DateTime.Parse(DateTime.Now.ToShortDateString)
+        Dim dt As DateTime
+
+        args.IsValid = (DateTime.TryParse(args.Value, dt) AndAlso
+                     dt <= maxDate AndAlso
+                     dt >= minDate) And dt < Date.Now.AddDays(-1)
+    End Sub
 End Class
\ No newline at end of file
diff --git a/css/Customers/CustomerAVISO.css b/css/Customers/CustomerAVISO.css
index bbd0da8..5c0d65a 100644
--- a/css/Customers/CustomerAVISO.css
+++ b/css/Customers/CustomerAVISO.css
@@ -152,8 +152,14 @@ hr{
         background-color:salmon;
         border: 1px solid red;
     }
-    @media (max-width: 558.98px) {
-        h1 {
+#pickdate1:valid{
+    color:black;
+}
+#pickdate1:invalid{
+    border: 1px solid red;
+}
+@media (max-width: 558.98px) {
+    h1 {
         color: #043381;
         font-size: 22px;
     }