X-Git-Url: https://plomlompom.com/repos/berlin_corona.txt?a=blobdiff_plain;f=plomtask%2Fdays.py;h=4e0c4747809bc1e352e492cf619fafb41f3f0bbb;hb=357e434444f45ddb3df506b18c5d12fbab2b9153;hp=8db9f15b7362ede61c70265e4d5eb8a4c2c0c626;hpb=4546631ed7cc59f3e66a1902b28930f955b2b03f;p=plomtask

diff --git a/plomtask/days.py b/plomtask/days.py
index 8db9f15..4e0c474 100644
--- a/plomtask/days.py
+++ b/plomtask/days.py
@@ -1,16 +1,27 @@
-#!/usr/bin/env python3
 """Collecting Day and date-related items."""
 from datetime import datetime
+from plomtask.misc import HandledException
 
 DATE_FORMAT = '%Y-%m-%d'
 
 
+def date_valid(date: str):
+    """Validate date against DATE_FORMAT, return Datetime or None."""
+    try:
+        result = datetime.strptime(date, DATE_FORMAT)
+    except (ValueError, TypeError):
+        return None
+    return result
+
+
 class Day:
     """Individual days defined by their dates."""
 
     def __init__(self, date: str):
         self.date = date
-        self.datetime = datetime.strptime(date, DATE_FORMAT)
+        self.datetime = date_valid(self.date)
+        if not self.datetime:
+            raise HandledException(f'Given date of wrong format: {self.date}')
 
     @property
     def weekday(self):