From 5fbea6202fc2d0e7d348703ad7dde3897ba06c2b Mon Sep 17 00:00:00 2001
From: Talha Mansoor <talha131@gmail.com>
Date: Sun, 10 Nov 2013 01:38:44 +0500
Subject: [PATCH] Check argument type in get_date utility function before
 processing it

Sitemap plugin calls this method to convert `modified` metadate into
datetime. Depending on the version of Pelican `modified` can be string
or a datetime object.

Therefore get_date should check for the type of argument otherwise
Pelican fails with a critical error.
---
 pelican/utils.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pelican/utils.py b/pelican/utils.py
index 4b25ec7f..2e315c3d 100644
--- a/pelican/utils.py
+++ b/pelican/utils.py
@@ -180,6 +180,8 @@ def get_date(string):
 
     If no format matches the given date, raise a ValueError.
     """
+    if isinstance(string, datetime):
+        return string
     string = re.sub(' +', ' ', string)
     formats = [
         # ISO 8601