Allow for multiple date formats

atst/forms/fields.py

@@ -7,7 +7,17 @@ import pendulum
 class DateField(DateField):
     def _value(self):
         if self.data:
-            return pendulum.parse(self.data).date()
+            date_formats = [
+                "YYYY-MM-DD",
+                "MM/DD/YYYY"
+            ]
+            for _format in date_formats:
+                try:
+                    return pendulum.from_format(self.data, _format).date()
+                except (ValueError, pendulum.parsing.exceptions.ParserError):
+                    pass
+
+            raise ValueError("Unable to parse string {}".format(self.data))
         else:
             return None