public function getGanttDivAttributes(Aoe_Scheduler_Model_Schedule $schedule)
    {

        if ($schedule->getStatus() == Aoe_Scheduler_Model_Schedule::STATUS_RUNNING) {
            $duration = time() - strtotime($schedule->getStarttime());
        } else {
            $duration = $schedule->getDuration() ? $schedule->getDuration() : 0;
        }
        $duration = $duration / $this->zoom;
        $duration = ceil($duration / 4) * 4 - 1; // round to numbers dividable by 4, then remove 1 px border
        $duration = max($duration, 3);

        $offset = (strtotime($schedule->getStarttime()) - $this->starttime) / $this->zoom;

        if ($offset < 0) { // cut bar
            $duration += $offset;
            $offset = 0;
        }

        $result = sprintf(
            '<div class="task %s" id="id_%s" style="width: %spx; left: %spx;" ></div>',
            $schedule->getStatus(),
            $schedule->getScheduleId(),
            $duration,
            $offset
        );

        if ($schedule->getStatus() == Aoe_Scheduler_Model_Schedule::STATUS_RUNNING) {
            $offset += $duration;

            $duration = strtotime($schedule->getEta()) - time();
            $duration = $duration / $this->zoom;

            $result = sprintf(
                '<div class="estimation" style="width: %spx; left: %spx;" ></div>',
                $duration,
                $offset
            ) . $result;
        }

        return $result;
    }