How to change date format in notification using mail script ServiceNow

var gr = new GlideRecord("incident");
gr.addQuery("sys_id",current.sys_id)
gr.query();
if(gr.next())
{
var nd = new GlideDateTime(gr.sys_created_on);
var fd = new GlideDateTime(nd);
 var dateToPrint = fd.getDate();
gs.print(dateToPrint.getByFormat('MMM-dd-YYYY'));
}

Output: