diff --git a/KlassenBIB/Sanieren.cs b/KlassenBIB/Sanieren.cs
index f345980..1fe5557 100644
--- a/KlassenBIB/Sanieren.cs
+++ b/KlassenBIB/Sanieren.cs
@@ -9,11 +9,11 @@ namespace KlassenBIB
     public abstract class Sanieren : Sanierung
     {
         Guid guid;
-        DateTime datum;
+        DateTime? datum;
         bool fertig = false;
 
         public Guid Guid { get => guid; set => guid = value; }
-        public DateTime Datum { get => datum; set => datum = value; }
+        public DateTime? Datum { get => datum; set => datum = value; }
         public bool Fertig { get => fertig; set => fertig = value; }
     }
 }
diff --git a/SanSystem/UCInliner.Designer.cs b/SanSystem/UCInliner.Designer.cs
index 69303c0..749f829 100644
--- a/SanSystem/UCInliner.Designer.cs
+++ b/SanSystem/UCInliner.Designer.cs
@@ -30,6 +30,9 @@
         {
             this.tabControl1 = new System.Windows.Forms.TabControl();
             this.tabPage2 = new System.Windows.Forms.TabPage();
+            this.cb_fertig = new System.Windows.Forms.CheckBox();
+            this.cbb_wetter = new System.Windows.Forms.ComboBox();
+            this.label24 = new System.Windows.Forms.Label();
             this.groupBox3 = new System.Windows.Forms.GroupBox();
             this.btn_get_temp = new System.Windows.Forms.Button();
             this.txt_temp_kanal = new System.Windows.Forms.TextBox();
@@ -62,9 +65,8 @@
             this.label11 = new System.Windows.Forms.Label();
             this.label10 = new System.Windows.Forms.Label();
             this.label9 = new System.Windows.Forms.Label();
-            this.cbb_wetter = new System.Windows.Forms.ComboBox();
-            this.label24 = new System.Windows.Forms.Label();
-            this.cb_fertig = new System.Windows.Forms.CheckBox();
+            this.dt_eingebaut = new System.Windows.Forms.DateTimePicker();
+            this.label1 = new System.Windows.Forms.Label();
             this.tabControl1.SuspendLayout();
             this.tabPage2.SuspendLayout();
             this.groupBox3.SuspendLayout();
@@ -86,6 +88,8 @@
             // 
             // tabPage2
             // 
+            this.tabPage2.Controls.Add(this.label1);
+            this.tabPage2.Controls.Add(this.dt_eingebaut);
             this.tabPage2.Controls.Add(this.cb_fertig);
             this.tabPage2.Controls.Add(this.cbb_wetter);
             this.tabPage2.Controls.Add(this.label24);
@@ -105,6 +109,42 @@
             this.tabPage2.Text = "Vorraussetzungen";
             this.tabPage2.UseVisualStyleBackColor = true;
             // 
+            // cb_fertig
+            // 
+            this.cb_fertig.AutoSize = true;
+            this.cb_fertig.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
+            this.cb_fertig.Font = new System.Drawing.Font("Microsoft Sans Serif", 20.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
+            this.cb_fertig.Location = new System.Drawing.Point(573, 347);
+            this.cb_fertig.Name = "cb_fertig";
+            this.cb_fertig.Size = new System.Drawing.Size(100, 35);
+            this.cb_fertig.TabIndex = 25;
+            this.cb_fertig.Text = "Fertig";
+            this.cb_fertig.UseVisualStyleBackColor = true;
+            this.cb_fertig.CheckedChanged += new System.EventHandler(this.cb_fertig_CheckedChanged);
+            // 
+            // cbb_wetter
+            // 
+            this.cbb_wetter.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
+            this.cbb_wetter.FormattingEnabled = true;
+            this.cbb_wetter.Items.AddRange(new object[] {
+            "Trocken",
+            "Niederschlag",
+            "Schnee - Eisschmelze"});
+            this.cbb_wetter.Location = new System.Drawing.Point(205, 348);
+            this.cbb_wetter.Name = "cbb_wetter";
+            this.cbb_wetter.Size = new System.Drawing.Size(282, 28);
+            this.cbb_wetter.TabIndex = 23;
+            // 
+            // label24
+            // 
+            this.label24.AutoSize = true;
+            this.label24.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
+            this.label24.Location = new System.Drawing.Point(8, 351);
+            this.label24.Name = "label24";
+            this.label24.Size = new System.Drawing.Size(57, 20);
+            this.label24.TabIndex = 24;
+            this.label24.Text = "Wetter";
+            // 
             // groupBox3
             // 
             this.groupBox3.Controls.Add(this.btn_get_temp);
@@ -454,40 +494,21 @@
             this.label9.TabIndex = 0;
             this.label9.Text = "Harz";
             // 
-            // cbb_wetter
+            // dt_eingebaut
             // 
-            this.cbb_wetter.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
-            this.cbb_wetter.FormattingEnabled = true;
-            this.cbb_wetter.Items.AddRange(new object[] {
-            "Trocken",
-            "Niederschlag",
-            "Schnee - Eisschmelze"});
-            this.cbb_wetter.Location = new System.Drawing.Point(205, 348);
-            this.cbb_wetter.Name = "cbb_wetter";
-            this.cbb_wetter.Size = new System.Drawing.Size(282, 28);
-            this.cbb_wetter.TabIndex = 23;
+            this.dt_eingebaut.Location = new System.Drawing.Point(205, 434);
+            this.dt_eingebaut.Name = "dt_eingebaut";
+            this.dt_eingebaut.Size = new System.Drawing.Size(291, 26);
+            this.dt_eingebaut.TabIndex = 26;
             // 
-            // label24
+            // label1
             // 
-            this.label24.AutoSize = true;
-            this.label24.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
-            this.label24.Location = new System.Drawing.Point(8, 351);
-            this.label24.Name = "label24";
-            this.label24.Size = new System.Drawing.Size(57, 20);
-            this.label24.TabIndex = 24;
-            this.label24.Text = "Wetter";
-            // 
-            // cb_fertig
-            // 
-            this.cb_fertig.AutoSize = true;
-            this.cb_fertig.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
-            this.cb_fertig.Font = new System.Drawing.Font("Microsoft Sans Serif", 20.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
-            this.cb_fertig.Location = new System.Drawing.Point(573, 347);
-            this.cb_fertig.Name = "cb_fertig";
-            this.cb_fertig.Size = new System.Drawing.Size(100, 35);
-            this.cb_fertig.TabIndex = 25;
-            this.cb_fertig.Text = "Fertig";
-            this.cb_fertig.UseVisualStyleBackColor = true;
+            this.label1.AutoSize = true;
+            this.label1.Location = new System.Drawing.Point(47, 439);
+            this.label1.Name = "label1";
+            this.label1.Size = new System.Drawing.Size(108, 20);
+            this.label1.TabIndex = 27;
+            this.label1.Text = "Eingebaut am";
             // 
             // UCInliner
             // 
@@ -551,5 +572,7 @@
         private System.Windows.Forms.ComboBox cbb_wetter;
         private System.Windows.Forms.Label label24;
         private System.Windows.Forms.CheckBox cb_fertig;
+        private System.Windows.Forms.Label label1;
+        private System.Windows.Forms.DateTimePicker dt_eingebaut;
     }
 }
diff --git a/SanSystem/UCInliner.cs b/SanSystem/UCInliner.cs
index 5ef5996..0ad1f7b 100644
--- a/SanSystem/UCInliner.cs
+++ b/SanSystem/UCInliner.cs
@@ -8,6 +8,8 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using KlassenBIB;
+using System.Diagnostics;
+using System.IO;
 
 namespace SanSystem
 {
@@ -67,6 +69,10 @@ namespace SanSystem
 
             cb_fertig.DataBindings.Add(new Binding("Checked", inliner, "fertig"));
             cbb_wetter.DataBindings.Add(new Binding("Text", inliner, "Wetter"));
+            if (inliner.Datum != null)
+                dt_eingebaut.DataBindings.Add(new Binding("Value", inliner, "Datum"));
+            else
+                dt_eingebaut.Enabled = false;
             cb_genehmigung.DataBindings.Add(new Binding("Checked", inliner, "genehmigungVorhanden"));
             cb_stvo.DataBindings.Add(new Binding("Checked", inliner, "sTVOAbsicherung"));
             cb_wasserhaltung.DataBindings.Add(new Binding("Checked", inliner, "wasserhaltungEingerichtet"));
@@ -74,5 +80,27 @@ namespace SanSystem
             txt_temp_kanal.DataBindings.Add(new Binding("Text", inliner, "TempKanal"));
             
         }
+
+        private void cb_fertig_CheckedChanged(object sender, EventArgs e)
+        {
+            if(cb_fertig.CheckState == CheckState.Checked)
+            {
+                if(inliner.Datum == null)
+                {
+                    inliner.Datum = DateTime.Now;
+                    dt_eingebaut.DataBindings.Clear();
+                    dt_eingebaut.DataBindings.Add(new Binding("Value", inliner, "Datum"));
+                    dt_eingebaut.Enabled = true;
+
+                }
+            }
+        }
+
+        private void CheckDirectories()
+        {
+            string verzeichnispfad = string.Format("{0}-{1}")
+            string path = Path.Combine("")
+            if(!Directory.Exists())
+        }
     }
 }