diff --git a/old/__init__.py b/old/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/old/date.py b/old/date.py
new file mode 100644
index 0000000..dfc09d2
--- /dev/null
+++ b/old/date.py
@@ -0,0 +1,19 @@
+from datetime import datetime
+
+
+def get_input() -> str:
+    input_value = input('Datum: ')
+    if input_value == 'x':
+        exit()
+
+    return input_value
+
+
+if __name__ == '__main__':
+    while True:
+        try:
+            value1 = datetime.strptime(get_input(), '%d.%m.%Y')
+            value2 = datetime.strptime(get_input(), '%d.%m.%Y')
+            print(f'Die Differenz aus {value2} und {value2} ist {abs((value1 - value2).days)}')
+        except Exception as e:
+            print(f'Ungültige Eingabe! {e}')
diff --git a/old/sqrt.py b/old/sqrt.py
new file mode 100644
index 0000000..f3ed7d6
--- /dev/null
+++ b/old/sqrt.py
@@ -0,0 +1,12 @@
+import math
+
+if __name__ == '__main__':
+    while True:
+        try:
+            input_value = input('Berechne die Quadratwurzel aus: ')
+            if input_value == 'x':
+                exit()
+            value = float(input_value)
+            print(f'Die Quadratwurzel aus {value} ist {float(math.sqrt(value))}')
+        except Exception as e:
+            print(f'Ungültige Eingabe! {e}')