two Fileds type are Date/Time and but mttr fields type is duration type then how to calculate mttr

[sangitak]

two Fileds type are Date/Time and but mttr fields type is duration type then how to calculate mttr based on created and resolved. i try to do below is the code: but i am getting output in datetime value but i want output value mttr in duration . If anyone know Please assit me on this issue.

 var mttr = GlideDateTime.subtract(new GlideDateTime(current.getValue('resolved_at')), new GlideDateTime(current.getValue('sys_created_on')));

    var difference = new GlideDuration(mttr);

    current.u_rpt_mttr = difference;

    gs.log("Resolved date" + current.getValue('resolved_at'));

    gs.log("Created date" + current.getValue('sys_created_on'));

    gs.log("Mttr Timing" + current.u_rpt_mttr);

    current.update();