Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55228
Allow applications to set an HTTP date header

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1522022 13f79535-47bb-0310-9956-ffa450edef68
Proposal

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1522026 13f79535-47bb-0310-9956-ffa450edef68
Proposal

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1522052 13f79535-47bb-0310-9956-ffa450edef68