diff --git a/README.md b/README.md
index 3a3c42a..9ac5143 100644
--- a/README.md
+++ b/README.md
@@ -76,5 +76,5 @@ class WhoisOrg(WhoisEntry):
     if text.strip() == 'NOT FOUND':
       raise WhoisDomainNotFoundError(text)
     else:
-      WhoisEntry.__init__(self, domain, text)
+      WhoisEntry.__init__(self, domain, text, self.regex)
 ```
diff --git a/test/test_main.py b/test/test_main.py
index 97a1595..b0bdf6f 100644
--- a/test/test_main.py
+++ b/test/test_main.py
@@ -1,6 +1,7 @@
 # coding=utf-8
 
 import unittest
+
 from whois import extract_domain
 
 
diff --git a/test/test_nicclient.py b/test/test_nicclient.py
index e08216d..d56593c 100644
--- a/test/test_nicclient.py
+++ b/test/test_nicclient.py
@@ -1,6 +1,7 @@
 # coding=utf-8
 
 import unittest
+
 from whois.whois import NICClient
 
 
diff --git a/test/test_parser.py b/test/test_parser.py
index a58a4a0..16af0a4 100644
--- a/test/test_parser.py
+++ b/test/test_parser.py
@@ -1,14 +1,17 @@
 # -*- coding: utf-8 -*-
 
-import os
 import datetime
 import json
-from glob import glob
+import os
 import unittest
+from glob import glob
+
+from whois.exceptions import WhoisUnknownDateFormatError
 from whois.parser import (
+    WhoisCa,
     WhoisEntry,
     cast_date,
-    WhoisCa,
+    datetime_parse,
 )
 
 
@@ -32,6 +35,10 @@ def test_cast_date(self):
             r = cast_date(d).strftime("%Y-%m-%d")
             self.assertEqual(r, "2008-04-14")
 
+    def test_unknown_date_format(self):
+        with self.assertRaises(WhoisUnknownDateFormatError):
+            datetime_parse("UNKNOWN")
+
     def test_com_allsamples(self):
         """
         Iterate over all of the sample/whois/*.com files, read the data,
diff --git a/test/test_query.py b/test/test_query.py
index acb777e..7b2789d 100644
--- a/test/test_query.py
+++ b/test/test_query.py
@@ -1,6 +1,7 @@
 # coding=utf-8
 
 import unittest
+
 from whois import whois
 
 
diff --git a/whois/__init__.py b/whois/__init__.py
index 21e0990..1e494e2 100644
--- a/whois/__init__.py
+++ b/whois/__init__.py
@@ -12,7 +12,6 @@
 from .parser import WhoisEntry
 from .whois import NICClient
 
-
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
 handler = logging.StreamHandler()
diff --git a/whois/parser.py b/whois/parser.py
index 168d7a3..b1b87c4 100644
--- a/whois/parser.py
+++ b/whois/parser.py
@@ -9,8 +9,9 @@
 import json
 import re
 from datetime import datetime
-import dateutil.parser as dp
 from typing import Any, Callable, Optional, Union
+
+import dateutil.parser as dp
 from dateutil.utils import default_tzinfo
 
 from .exceptions import WhoisDomainNotFoundError, WhoisUnknownDateFormatError
diff --git a/whois/whois.py b/whois/whois.py
index 4fdce43..f9718f0 100644
--- a/whois/whois.py
+++ b/whois/whois.py
@@ -28,8 +28,8 @@
 """
 
 import logging
-import os
 import optparse
+import os
 import re
 import socket
 import sys