Adding Try and Except

Adding try and except, so app doesn't throw an error when initially run

app.py

@@ -3,24 +3,29 @@ import datetime
 from math import ceil
 
 date_str=st.text_area("Enter a date (format: yyyy-mm-dd): ")
+today = datetime.datetime.now().date() 
 
 # Convert the input string to a datetime object
-date = datetime.datetime.strptime(date_str, "%Y-%m-%d")
+try:
+    date = datetime.datetime.strptime(date_str, "%Y-%m-%d")
 
 # Calculate the dates 500, 1000, 1500, 2000, and 2500 days after the input date
-dates_after = []
-cutoff=(today - date.date()).days+2001
-day_list=list(range(500,2501,500))+list(range(3000,cutoff,1000))
-for days in day_list:
-    delta = datetime.timedelta(days=days)
-    dates_after.append(date + delta)
+    dates_after = []
+    cutoff=(today - date.date()).days+2001
+    day_list=list(range(500,2501,500))+list(range(3000,cutoff,1000))
+    for days in day_list:
+        delta = datetime.timedelta(days=days)
+        dates_after.append(date + delta)
     
 # Calculate the next multiple of 500 days after the current date
-delta_days = 500*(ceil((today - date.date()).days/500))
-next_multiple = date + datetime.timedelta(days=delta_days)
+    delta_days = 500*(ceil((today - date.date()).days/500))
+    next_multiple = date + datetime.timedelta(days=delta_days)
 
 # Print the results
-print("Input date:", date.strftime("%Y-%m-%d"))
-print("Next multiple of 500:", delta_days, "days on", next_multiple.strftime("%Y-%m-%d"),"\n")
-for i, date_after in enumerate(dates_after):
-    print(f"{day_list[i]} days after input date:", date_after.strftime("%Y-%m-%d"))
+    print("Input date:", date.strftime("%Y-%m-%d"))
+    print("Next multiple of 500:", delta_days, "days on", next_multiple.strftime("%Y-%m-%d"),"\n")
+    for i, date_after in enumerate(dates_after):
+        print(f"{day_list[i]} days after input date:", date_after.strftime("%Y-%m-%d"))
+
+except ValueError:
+    print("Date should be in format yyyy-mm-dd")