diff --git a/feedgen/entry.py b/feedgen/entry.py
index bf17d5f..bf50357 100644
--- a/feedgen/entry.py
+++ b/feedgen/entry.py
@@ -12,7 +12,7 @@ from lxml import etree
 from datetime import datetime
 import dateutil.parser
 import dateutil.tz
-from feedgen.util import ensure_format
+from feedgen.util import ensure_format, formatRFC2822
 from feedgen.compat import string_types
 
 
@@ -220,8 +220,7 @@ class FeedEntry(object):
 			enclosure.attrib['type'] = self.__rss_enclosure['type']
 		if self.__rss_pubDate:
 			pubDate = etree.SubElement(entry, 'pubDate')
-			pubDate.text = self.__rss_pubDate.strftime(
-					'%a, %d %b %Y %H:%M:%S %z')
+			pubDate.text = formatRFC2822(self.__rss_pubDate)
 
 		if extensions:
 			for ext in self.__extensions.values() or []:
diff --git a/feedgen/feed.py b/feedgen/feed.py
index ad38109..4c09dd3 100644
--- a/feedgen/feed.py
+++ b/feedgen/feed.py
@@ -14,7 +14,7 @@ from datetime import datetime
 import dateutil.parser
 import dateutil.tz
 from feedgen.entry import FeedEntry
-from feedgen.util import ensure_format
+from feedgen.util import ensure_format, formatRFC2822
 import feedgen.version
 import sys
 from feedgen.compat import string_types
@@ -313,15 +313,14 @@ class FeedGenerator(object):
 			language.text = self.__rss_language
 		if self.__rss_lastBuildDate:
 			lastBuildDate = etree.SubElement(channel, 'lastBuildDate')
-			lastBuildDate.text = self.__rss_lastBuildDate.strftime(
-					'%a, %d %b %Y %H:%M:%S %z')
+
+			lastBuildDate.text = formatRFC2822(self.__rss_lastBuildDate)
 		if self.__rss_managingEditor:
 			managingEditor = etree.SubElement(channel, 'managingEditor')
 			managingEditor.text = self.__rss_managingEditor
 		if self.__rss_pubDate:
 			pubDate = etree.SubElement(channel, 'pubDate')
-			pubDate.text = self.__rss_pubDate.strftime(
-					'%a, %d %b %Y %H:%M:%S %z')
+			pubDate.text = formatRFC2822(self.__rss_pubDate)
 		if self.__rss_rating:
 			rating = etree.SubElement(channel, 'rating')
 			rating.text = self.__rss_rating
diff --git a/feedgen/util.py b/feedgen/util.py
index 3f3d97e..c7c9454 100644
--- a/feedgen/util.py
+++ b/feedgen/util.py
@@ -8,7 +8,7 @@
 	:copyright: 2013, Lars Kiesow <lkiesow@uos.de>
 	:license: FreeBSD and LGPL, see license.* for more details.
 '''
-import sys
+import sys, locale
 
 
 def ensure_format(val, allowed, required, allowed_values=None, defaults=None):
@@ -60,3 +60,13 @@ def ensure_format(val, allowed, required, allowed_values=None, defaults=None):
 			if elem.get(k) and not elem[k] in v:
 				raise ValueError('Invalid value for %s' % k )
 	return val
+
+
+def formatRFC2822(d):
+	'''Make sure the locale setting do not interfere with the time format.
+	'''
+	l = locale.setlocale(locale.LC_ALL)
+	locale.setlocale(locale.LC_ALL, 'C')
+	d = d.strftime('%a, %d %b %Y %H:%M:%S %z')
+	locale.setlocale(locale.LC_ALL, l)
+	return d