Provide explicit DateUtil support for formatting Dates in an unknown timezone, matching what TestMetadata checks detail, and allow for setting a Metadata date value from a Calendar. Finally, use this for the TTF dates, to hopefully solve the TIKA-1325 test problem

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1601385 13f79535-47bb-0310-9956-ffa450edef68