位置
$HADOOP_HOME/share/hadoop/yarn/hadoop-yarn-common-2.6.1.jar

查看
jar tf hadoop-yarn-common-2.6.1.jar |grep yarn.dt.plugins.js
webapps/static/yarn.dt.plugins.js

解压
jar -xvf hadoop-yarn-common-2.6.1.jar webapps/static/yarn.dt.plugins.js
inflated: webapps/static/yarn.dt.plugins.js

修改

vi webapps/static/yarn.dt.plugins.js

return new Date(parseInt(data)).toLocaleString();

更新
jar -uvf hadoop-yarn-common-2.6.1.jar webapps/static/yarn.dt.plugins.js

强刷页面即可