Added a usegmt flag to email.Utils.formatdate - this allows it to be

used to replace rfc822.formatdate for protocols like HTTP (where 'GMT' must
be the timezone string).

Doc/lib/emailutil.tex

@@ -84,7 +84,7 @@ changes in daylight savings time, though not worth worrying about for
 common use.
 \end{funcdesc}
 
-\begin{funcdesc}{formatdate}{\optional{timeval\optional{, localtime}}}
+\begin{funcdesc}{formatdate}{\optional{timeval\optional{, localtime}\optional{, usegmt}}}
 Returns a date string as per \rfc{2822}, e.g.:
 
 \begin{verbatim}
@@ -99,6 +99,11 @@ Optional \var{localtime} is a flag that when \code{True}, interprets
 \var{timeval}, and returns a date relative to the local timezone
 instead of UTC, properly taking daylight savings time into account.
 The default is \code{False} meaning UTC is used.
+
+Optional \var{usegmt} is a flag that when \code{True}, outputs a 
+date string with the timezone as an ascii string \code{GMT}, rather
+than a numeric \code{-0000}. This is needed for some protocols (such
+as HTTP). This only applies when \var{localtime} is \code{False}
 \end{funcdesc}
 
 \begin{funcdesc}{make_msgid}{\optional{idstring}}

Lib/email/Utils.py

@@ -103,7 +103,7 @@ ecre = re.compile(r'''
 
 
 
-def formatdate(timeval=None, localtime=False):
+def formatdate(timeval=None, localtime=False, usegmt=False):
     """Returns a date string as specified by RFC 2822, e.g.:
 
     Fri, 09 Nov 2001 01:08:47 -0000
@@ -114,6 +114,10 @@ def formatdate(timeval=None, localtime=False):
     Optional localtime is a flag that when True, interprets timeval, and
     returns a date relative to the local timezone instead of UTC, properly
     taking daylight savings time into account.
+
+    Optional argument usegmt means that the timezone is written out as 
+    an ascii string, not numeric one (so "GMT" instead of "+0000"). This
+    is needed for HTTP, and is only used when localtime==False.
     """
     # Note: we cannot use strftime() because that honors the locale and RFC
     # 2822 requires that day and month names be the English abbreviations.
@@ -138,7 +142,10 @@ def formatdate(timeval=None, localtime=False):
     else:
         now = time.gmtime(timeval)
         # Timezone offset is always -0000
-        zone = '-0000'
+        if usegmt:
+            zone = 'GMT'
+        else:
+            zone = '-0000'
     return '%s, %02d %s %04d %02d:%02d:%02d %s' % (
         ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'][now[6]],
         now[2],

Lib/email/test/test_email.py

@@ -2037,6 +2037,15 @@ class TestMiscellaneous(unittest.TestCase):
             Utils.parsedate(Utils.formatdate(now, localtime=True))[:6],
             time.localtime(now)[:6])
 
+    def test_formatdate_usegmt(self):
+        now = time.time()
+        self.assertEqual(
+            Utils.formatdate(now, localtime=False),
+            time.strftime('%a, %d %b %Y %H:%M:%S -0000', time.gmtime(now)))
+        self.assertEqual(
+            Utils.formatdate(now, localtime=False, usegmt=True),
+            time.strftime('%a, %d %b %Y %H:%M:%S GMT', time.gmtime(now)))
+
     def test_parsedate_none(self):
         self.assertEqual(Utils.parsedate(''), None)
 

Lib/urllib.py

@@ -410,7 +410,7 @@ class URLopener:
 
     def open_local_file(self, url):
         """Use local file."""
-        import mimetypes, mimetools, rfc822, StringIO
+        import mimetypes, mimetools, email.Utils, StringIO
         host, file = splithost(url)
         localname = url2pathname(file)
         try:
@@ -418,7 +418,7 @@ class URLopener:
         except OSError, e:
             raise IOError(e.errno, e.strerror, e.filename)
         size = stats.st_size
-        modified = rfc822.formatdate(stats.st_mtime)
+        modified = email.Utils.formatdate(stats.st_mtime, usegmt=True)
         mtype = mimetypes.guess_type(url)[0]
         headers = mimetools.Message(StringIO.StringIO(
             'Content-Type: %s\nContent-Length: %d\nLast-modified: %s\n' %

Lib/urllib2.py

@@ -99,7 +99,6 @@ import os
 import posixpath
 import random
 import re
-import rfc822
 import sha
 import socket
 import sys
@@ -1129,12 +1128,13 @@ class FileHandler(BaseHandler):
 
     # not entirely sure what the rules are here
     def open_local_file(self, req):
+        import email.Utils
         host = req.get_host()
         file = req.get_selector()
         localfile = url2pathname(file)
         stats = os.stat(localfile)
         size = stats.st_size
-        modified = rfc822.formatdate(stats.st_mtime)
+        modified = email.Utils.formatdate(stats.st_mtime, usegmt=True)
         mtype = mimetypes.guess_type(file)[0]
         headers = mimetools.Message(StringIO(
             'Content-type: %s\nContent-length: %d\nLast-modified: %s\n' %