use dateutil to parse timestamps

debian/control

@@ -7,7 +7,7 @@ Standards-Version: 3.9.1
 
 Package: python-rfc3161
 Architecture: all
-Depends: ${misc:Depends}, ${python:Depends}, python-pyasn1, python-pyasn1-modules, python-m2crypto
+Depends: ${misc:Depends}, ${python:Depends}, python-pyasn1, python-pyasn1-modules, python-m2crypto, python-dateutil
 Description: Python implementation of the RFC3161 specification
  A simple client library for cryptographic timestamping service implementing the
  protocol from RFC3161.

rfc3161/api.py

@@ -1,8 +1,8 @@
-import datetime
 import hashlib
 import requests
 import base64
 
+import dateutil.parser
 from pyasn1.codec.der import encoder, decoder
 from pyasn1_modules import rfc2459
 from pyasn1.type import univ
@@ -48,7 +48,7 @@ def get_timestamp(tst):
         if substrate:
             raise ValueError("extra data after tst")
         genTime = tstinfo.getComponentByName('genTime')
-        return datetime.datetime.strptime(str(genTime), '%Y%m%d%H%M%SZ')
+        return dateutil.parser.parse(str(genTime))
     except PyAsn1Error, e:
         raise ValueError('not a valid TimeStampToken', e)
 

setup.py

@@ -12,6 +12,7 @@ setup(name='rfc3161',
       packages=['rfc3161'],
       install_requires=[
           'pyasn1',
+          'python-dateutil',
           'pyasn1_modules',
           'requests',
           'M2Crypto'])