public static function getDueDateDelta($time)
    {
        if ( $time < 600 ) {
            $delta = $time . ' seconds';
        } else if ($time < 3600) {
            $delta = sprintf("%0.0f",($time/60.0)) . ' ' . _m('minutes');
        } else if ($time <= 86400 ) {
            $delta = sprintf("%0.2f",($time/3600.0)) . ' ' . _m('hours');
        } else {
            $delta = sprintf("%0.2f",($time/86400.0)) . ' ' . _m('days');
        }
        return $delta;
    }