1 files changed, 5 insertions, 2 deletions
diff --git a/pygithub3/resources/base.py b/pygithub3/resources/base.py
index 7045529..4c65b8b 100644
--- a/pygithub3/resources/base.py
+++ b/pygithub3/resources/base.py
@@ -1,8 +1,12 @@
 #!/usr/bin/env python
 # -*- encoding: utf-8 -*-
 
+from datetime import datetime
+
 from pygithub3.core.utils import json
 
+GITHUB_DATE_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
+
 
 class Resource(object):
 
@@ -44,9 +48,8 @@ class Resource(object):
             return wrapper
 
         def parse_date(string_date):
-            from datetime import datetime
             try:
-                date = datetime.strptime(string_date, '%Y-%m-%dT%H:%M:%SZ')
+                date = datetime.strptime(string_date, GITHUB_DATE_FORMAT)
             except TypeError:
                 date = None
             return date