diff --git a/last_bus_times.py b/last_bus_times.py
index d159110..d18db01 100644
--- a/last_bus_times.py
+++ b/last_bus_times.py
@@ -9,10 +9,6 @@ import numpy as np
 from plotly_calplot import calplot
 import plotly
 
-
-date_format = "%Y-%m-%d"
-yesterday = datetime.today() - timedelta(days=1)
-yesterday = yesterday.strftime(date_format)
 delay_csv = "delays.csv"
 delay_html = "output/delays.html"
 delay_png = "output/delays.png"
@@ -29,15 +25,17 @@ def get_delay(date_string: str) -> int:
         int: The delay in minutes.
     """
 
+
     vehicles = requests.get(
         f"https://bustimes.org/services/632-wigan-bus-station-bus-station/vehicles?date={date_string}").text
+
     last_joruney = re.findall(
         r'\#journeys\/(\d+)">([\d\:]+)<\/a>\s+<\/td>\s+<td>Chorley Town Centre',
         vehicles,
     )[-1]
 
     if last_joruney[1] != "23:20" and last_joruney[1] != "22:45":
-        print(f"No last bus at 23:20 or 22:45, last bus was at {last_joruney[1]}")
+        #print(f"No last bus at 23:20 or 22:45, last bus was at {last_joruney[1]}")
         return 60
     else:
         journey_info = requests.get(
@@ -51,6 +49,9 @@ def get_delay(date_string: str) -> int:
 
 
 def output_csv():
+    yesterday = datetime.today() - timedelta(days=1)
+    yesterday = yesterday.strftime("%Y-%m-%d")
+
     # Check if the file exists
     try:
         with open(delay_csv, "r") as file:
@@ -58,11 +59,14 @@ def output_csv():
             for row in reader:
                 if row[0] == yesterday:
                     break
+                    # If the entry for yesterday already exists, do nothing
+
             else:
                 # Add a new entry for yesterday
                 with open(delay_csv, "a", newline="") as file:
                     writer = csv.writer(file)
                     writer.writerow([yesterday, get_delay(yesterday)])
+
     except FileNotFoundError:
         # Create a new file and add the entry for yesterday
         with open(delay_csv, "w", newline="") as file:
@@ -70,6 +74,7 @@ def output_csv():
             writer.writerow(["Date", "Minutes Late"])
             writer.writerow([yesterday, get_delay(yesterday)])
 
+
 def make_plot():
     df = pd.read_csv(delay_csv)
     df["Date"] = pd.to_datetime(df["Date"])