gistfile1.py

>>> import datetime
>>> import pytz
>>>
>>> tz_tokyo = pytz.timezone('Asia/Tokyo')
>>>
>>> now = datetime.datetime.now()
>>> now.strftime('%Y-%m-%dT%H:%M:%S%z')
'2010-07-10T03:31:34'
>>>
>>> now = tz_tokyo.localize(now)
>>> now.strftime('%Y-%m-%dT%H:%M:%S%z')
'2010-07-10T03:31:34+0900'
>>> 

gistfile2.diff

--- a/atom.py
+++ b/atom.py
@@ -1,5 +1,5 @@
 
 def format_iso8601(obj):
     """Format a datetime object for iso8601"""
-        return obj.strftime('%Y-%m-%dT%H:%M:%SZ')
+        return obj.strftime('%Y-%m-%dT%H:%M:%S%z')