Fix datetime formatting on windows (issue jbalogh#23) by replacing %e…

… with %d,

this is the least complicated method of doing things but will cause
inconsistent behavior across systems.

Anyone has another suggestion?

jingo/helpers.py

@@ -4,6 +4,7 @@
 from django.core.urlresolvers import reverse
 
 import jinja2
+import platform
 
 from jingo import register
 
@@ -53,7 +54,10 @@ def nl2br(string):
 def datetime(t, fmt=None):
     """Call ``datetime.strftime`` with the given format string."""
     if fmt is None:
-        fmt = _('%B %e, %Y')
+        if platform.system() == "Windows":
+            fmt = _('%B %d, %Y')
+        else:
+            fmt = _('%B %e, %Y')
     return smart_unicode(t.strftime(fmt.encode('utf-8'))) if t else u''