Hi,
Create a onDisplay BR on your table. and in the script add this code.
i assume Time left is a duration field.
(function executeRule(current, previous /*null when async*/ ) {
var gdt = new GlideDateTime(current.im_notification); //put right field name
var gdt1 = new GlideDateTime(current.next_update_due); //put right field name
var dur = new GlideDuration();
dur = GlideDateTime.subtract(gdt, gdt1); //the difference between gdt1 and gdt2
current.u_time_left.setValue(dur); //put right field name.
})(current, previous);
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