truncate

Author: KommuSoft

timetest.py

@@ -20,7 +20,7 @@ def truncate(cls, dt):
         Returns:
                 date: The first day (January 1) of the decade in which `dt` falls.
         """
-        return date(10 * (dt.year // 10), 1, 1)
+        return date(max(10 * (dt.year // 10), 1), 1, 1)
 
     @classmethod
     def get_index_for_date(cls, dt):