fix datetime formatting in rss feed

panikweb/paniktags/templatetags/paniktags.py

+import email.utils
+import datetime
 import re
+import time
 import urllib2
 import uuid
 
@@ -185,3 +188,10 @@ class FormatSearchResultNode(template.Node):
 @register.inclusion_tag('includes/piwik.html')
 def piwik():
     return {'enabled': settings.ENABLE_PIWIK}
+
+
+@register.filter
+def rfc822(datetime):
+    if datetime is None:
+        return ''
+    return email.utils.formatdate(time.mktime(datetime.timetuple()))

panikweb_templates/templates/podcasts.html

-{% load soundfiles %}<?xml version="1.0" encoding="UTF-8"?>
+{% load paniktags %}{% load soundfiles %}<?xml version="1.0" encoding="UTF-8"?>
 <rss version="2.0"
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:content="http://purl.org/rss/1.0/modules/content/"
@@ -7,15 +7,15 @@
     <title>Radio Panik{% if title %} - {{ title }}{% endif %}</title>
     <link>{{ base_url }}</link>
     <description></description>
-    <lastBuildDate>{{ soundfiles.0.creation_timestamp|date:"r" }}</lastBuildDate>
+    <lastBuildDate>{{ soundfiles.0.creation_timestamp|rfc822 }}</lastBuildDate>
 
     {% for soundfile in soundfiles|slice:":20" %}<item>
         <title>{% if soundfile.fragment %}{{ soundfile.title }} - {% endif %}{{ soundfile.episode.title }}</title>
         <link>{{ base_url }}{% url 'episode-view' slug=soundfile.episode.slug emission_slug=soundfile.episode.emission.slug %}</link>
         <description>{{ soundfile.episode.text|striptags }}</description>
         <enclosure url="{{ base_url }}{{ soundfile|format_url:'mp3' }}" type="audio/mpeg"/>
-        <guid>{{ soundfile.episode.get_absolute_url }}-{{ soundfile.id }}</guid>
-        <pubDate>{{ soundfile.episode.creation_timestamp|date:"r" }} GMT</pubDate>
+        <guid>{{ base_url }}{{ soundfile.episode.get_absolute_url }}#{{ soundfile.id }}</guid>
+        <pubDate>{{ soundfile.episode.creation_timestamp|rfc822 }} GMT</pubDate>
     </item>
     {% endfor %}
 </channel>