repoze/repoze.who — pull request #12 by daghoidahl (2013-11-13 08:54:12+00:00)
Title: Cookie expiry date does not conform to RFC 2616 (http://tools.ietf.org/html/rfc2616#section-3.3.1 )

The Expires field is susceptible to locale changes and does not end with 'GMT'.