diff --git a/lib/TimeSlot.py b/lib/TimeSlot.py
index 4943bd5..7780d3c 100644
--- a/lib/TimeSlot.py
+++ b/lib/TimeSlot.py
@@ -28,7 +28,9 @@ class TimeSlot():
 
     @property
     def end(self):
-        return datetime.fromtimestamp(self._end)
+        if "_end" in self.__dict__:
+            return datetime.fromtimestamp(self._end)
+        return None
 
     @end.setter
     def end(self, d: datetime):
diff --git a/lib/ui.py b/lib/ui.py
new file mode 100644
index 0000000..906606b
--- /dev/null
+++ b/lib/ui.py
@@ -0,0 +1,16 @@
+from .TimeSlot import TimeSlot
+
+
+def convert_to_table(time_slot_list: list[TimeSlot]):
+    widths = [20, 26, 26]
+
+    r_str = f"+{'-'*(widths[0]+2)}+{'-'*(widths[1]+2)}+{'-'*(widths[2]+2)}+\n"
+    r_str += f"| {'Name':<20} | {'Startzeitpunkt':<26} | {'Endzeitpunkt':<26} |\n"
+    r_str += f"+{'-'*(widths[0]+2)}+{'-'*(widths[1]+2)}+{'-'*(widths[2]+2)}+\n"
+
+    for time_slot in time_slot_list:
+        r_str += f"| {time_slot.name:<20} | {str(time_slot.start):<26} | {str(time_slot.end):<26} |\n"
+
+    r_str += f"+{'-'*(widths[0]+2)}+{'-'*(widths[1]+2)}+{'-'*(widths[2]+2)}+"
+
+    return r_str
diff --git a/main.py b/main.py
index b7c3cff..ca131ab 100755
--- a/main.py
+++ b/main.py
@@ -3,6 +3,7 @@
 import argparse
 from lib.DataStore import DataStore
 from lib.TimeSlot import TimeSlot
+from lib.ui import convert_to_table
 
 
 if __name__ == "__main__":
@@ -16,4 +17,4 @@ if __name__ == "__main__":
     ds = DataStore("data.json")
 
     if args.command == "ls":
-        print(ds.get_all_time_slots())
+        print(convert_to_table(ds.get_all_time_slots()))