use timelib to parse string datetime reps

- timelib seems to be based on PHP's strtodate, which is way more
  flexible than python-dateutil's parser.parse() method

requirements.txt

@@ -9,6 +9,7 @@ nose==1.3.0
 pyOpenSSL==0.13
 pymongo==2.5
 python-dateutil==2.1
+timelib==0.2.4
 w3lib==1.2
 wsgiref==0.1.2
 zope.interface==4.0.5

scrapy_proj/openrecipes/util.py

@@ -1,5 +1,5 @@
 import isodate
-from dateutil.parser import parse
+import timelib
 from scrapy import log
 import bleach
 
@@ -45,7 +45,7 @@ def get_isodate(date_str):
     except isodate.ISO8601Error, e:
         # if not, try to parse it
         try:
-            iso_date = isodate.date_isoformat(parse(date_str))
+            iso_date = isodate.date_isoformat(timelib.strtodatetime(date_str))
         except Exception, e:
             log.msg(e.message, level=log.WARNING)
             return None
@@ -67,7 +67,7 @@ def get_isoduration(date_str):
     except isodate.ISO8601Error, e:
         # if not, try to parse it
         try:
-            delta = (parse(date_str) - parse(''))
+            delta = (timelib.strtodatetime(date_str) - timelib.strtodatetime('now'))
             iso_duration = isodate.duration_isoformat(delta)
         except Exception, e:
             log.msg(e.message, level=log.WARNING)

scrapy_proj/tests/util_tests.py

@@ -23,6 +23,9 @@ def test_parse_isoduration_2(self):
         delta = datetime.timedelta(minutes=15)
         self.assertEqual(delta, parse_isoduration('PT15M'))
 
+    def test_parse_isoduration_invalid(self):
+        self.assertEqual(None, parse_isoduration('PT1HPT1H'))
+
 
 class StripHTMLTests(unittest.TestCase):