diff --git a/stock_app_tapyr/view/root/server.py b/stock_app_tapyr/view/root/server.py
index 903f540..3232ef0 100644
--- a/stock_app_tapyr/view/root/server.py
+++ b/stock_app_tapyr/view/root/server.py
@@ -25,7 +25,7 @@ def get_data():
         return get_ticker().history(start=dates[0], end=dates[1])
 
     @reactive.calc
-    def get_change():
+    def get_change() -> float:
         close = get_data()["Close"]
         return close.iloc[-1] - close.iloc[-2]
 
diff --git a/stock_app_tapyr/view/root/ui.py b/stock_app_tapyr/view/root/ui.py
index 062faba..2e1f7fa 100644
--- a/stock_app_tapyr/view/root/ui.py
+++ b/stock_app_tapyr/view/root/ui.py
@@ -1,3 +1,4 @@
+from datetime import date
 from pathlib import Path
 
 import pandas as pd
@@ -9,7 +10,10 @@
 
 # Default to the last 6 months
 end = pd.Timestamp.now()
-start = end - pd.Timedelta(weeks=26)
+start_td = end - pd.Timedelta(weeks=26)
+if not isinstance(start_td, date):
+    raise ValueError("This will never happen")
+start = start_td.date()
 
 app_dir = Path(__file__).parent