timestamp

String timeStamp = TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis()) + "";

        long posttime = Long.parseLong( list_items.getTime());

        long nowtime = Long.parseLong(timeStamp);

        long diff = nowtime - posttime;

        int diffe = (int) diff;

        if (diffe<60) {

            String time = String.valueOf(diff);

            holder.date.setText(time+"s ago");

        } else if (diffe> 60 && diffe<3600) {

            diff = diff/60;

            String time = String.valueOf(diff);

            holder.date.setText(time+"m ago");

        } else if (diffe> 3600 && diffe<86400) {

            diff = diff/3600;

            String time = String.valueOf(diff);

            holder.date.setText(time+"h ago");

        } else if (diffe>86400) {

            diff = diff/86400;

            String time = String.valueOf(diff);

            holder.date.setText(time+"d ago");

        } else if (diffe == 60) {

            holder.date.setText("1m ago");

        } else if (diffe == 3600) {

            holder.date.setText("1h ago");

        } else if (diffe == 86400) {

            holder.date.setText("1d ago");

        }