fix update graphs

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1618806 13f79535-47bb-0310-9956-ffa450edef68
fix x date label

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1618807 13f79535-47bb-0310-9956-ffa450edef68