Fix: accept datetime for created (#10021)

src/documents/serialisers.py

@@ -965,6 +965,20 @@ class DocumentSerializer(
             ).isoformat()
         return doc
 
+    def to_internal_value(self, data):
+        if (
+            "created" in data
+            and isinstance(data["created"], str)
+            and ":" in data["created"]
+        ):
+            # Handle old format of isoformat datetime string
+            try:
+                data["created"] = datetime.fromisoformat(data["created"]).date()
+            except ValueError:  # pragma: no cover
+                # Just pass, validation will catch it
+                pass
+        return super().to_internal_value(data)
+
     def validate(self, attrs):
         if (
             "archive_serial_number" in attrs