change date metadata parsing to dateutil.parser

pelican/utils.py

@@ -15,7 +15,7 @@ import traceback
 
 from collections import Hashable
 from contextlib import contextmanager
-from datetime import datetime
+import dateutil.parser
 from functools import partial
 from itertools import groupby
 from jinja2 import Markup
@@ -181,39 +181,10 @@ def get_date(string):
     If no format matches the given date, raise a ValueError.
     """
     string = re.sub(' +', ' ', string)
-    formats = [
-        # ISO 8601
-        '%Y',
-        '%Y-%m',
-        '%Y-%m-%d',
-        '%Y-%m-%dT%H:%M%z',
-        '%Y-%m-%dT%H:%MZ',
-        '%Y-%m-%dT%H:%M',
-        '%Y-%m-%dT%H:%M:%S%z',
-        '%Y-%m-%dT%H:%M:%SZ',
-        '%Y-%m-%dT%H:%M:%S',
-        '%Y-%m-%dT%H:%M:%S.%f%z',
-        '%Y-%m-%dT%H:%M:%S.%fZ',
-        '%Y-%m-%dT%H:%M:%S.%f',
-        # end ISO 8601 forms
-        '%Y-%m-%d %H:%M',
-        '%Y-%m-%d %H:%M:%S',
-        '%Y/%m/%d %H:%M',
-        '%Y/%m/%d',
-        '%d-%m-%Y',
-        '%d.%m.%Y %H:%M',
-        '%d.%m.%Y',
-        '%d/%m/%Y',
-        ]
-    for date_format in formats:
-        try:
-            date = datetime.strptime(string, date_format)
-        except ValueError:
-            continue
-        if date_format.endswith('Z'):
-            date = date.replace(tzinfo=pytz.timezone('UTC'))
-        return date
-    raise ValueError('{0!r} is not a valid date'.format(string))
+    try:
+        return dateutil.parser.parse(string)
+    except (TypeError, ValueError):
+        raise ValueError('{0!r} is not a valid date'.format(string))
 
 
 @contextmanager