Added http_date utility function

src/milla/util.py

@@ -21,6 +21,10 @@ Please give me a docstring!
 :Updater: $Author$
 '''
 
+from wsgiref.handlers import format_date_time
+import datetime
+import time
+
 def asbool(val):
     '''Test a value for truth
     
@@ -47,3 +51,18 @@ def asbool(val):
     if val in ('false', 'no', 'f', 'n', 'off', '0'):
         return False
     return True
+
+
+def http_date(date):
+    '''Format a datetime object as a string in RFC 1123 format
+
+    This function returns a string representing the date according to
+    RFC 1123. The string returned will always be in English, as 
+    required by the specification.
+
+    :param date: A :py:class:`datetime.datetime` object
+    :return: RFC 1123-formatted string
+    '''
+
+    stamp = time.mktime(date.timetuple())
+    return format_date_time(stamp)