是不是quartz 的 crontrigger 不能和 setStartTime一起使用?

public static void main(String[] lyo)throws Exception{
		SchedulerFactory schedFact = new org.quartz.impl.StdSchedulerFactory();

        Scheduler sched = schedFact.getScheduler();

        

        JobDetail jobDetail = new JobDetail("CDCJob",
                                            "defaultGroup",
                                            JobTest.class);

        String cronExpress="0 33 07 * * ?";
        String startTime="2006-10-18 07:32:03";
        CronTrigger  trigger = new CronTrigger("CDCTrigger", "defaultGroup"); // fire every hour

        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date da=sdf.parse(startTime);
        log.debug("get da: "+da);
        trigger.setStartTime(da);  // start on the next even hour
        trigger.setCronExpression(cronExpress);

        sched.scheduleJob(jobDetail, trigger);
        sched.start();
	}