为什么我的工作立即被解雇/执行？

Question

示例：我已经将工作安排在下午4点，但是当我计划（下午3:30）工作时，它将立即执行。为什么立即触发。我是否会错过“属性”中的任何内容以在给定的计划时间执行。请帮助我。我使用简单的触发器来执行。

Properties FIle:
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Properties properties = new Properties();
        properties.put("org.quartz.scheduler.instanceId", "AUTO");
        properties.put("org.quartz.scheduler.instanceName", "Platform_Scheduler");
        properties.put("org.quartz.threadPool.class", "org.quartz.simpl.SimpleThreadPool");
        properties.put("org.quartz.threadPool.threadCount", quartzThreadCount);
        properties.put("org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread", "true");

        //specify the jobstore
        properties.put("org.quartz.jobStore.class", "org.quartz.impl.jdbcjobstore.JobStoreTX");
        properties.put("org.quartz.jobStore.driverDelegateClass", "org.quartz.impl.jdbcjobstore.StdJDBCDelegate");
        properties.put("org.quartz.jobStore.useProperties", "true");
        properties.put("org.quartz.jobStore.isClustered", "true");
        properties.put("org.quartz.jobStore.clusterCheckinInterval", "20000");

        //The datasource for the jobstore
        properties.put("org.quartz.jobStore.dataSource","IPDS");

        //Quartz table prefixes in the database
        properties.put("org.quartz.jobStore.tablePrefix", "QRTZ_");
        properties.put("org.quartz.jobStore.misfireThreshold", quartzMisfireThreshold);

        //The details of the datasource
        properties.put("org.quartz.dataSource.IPDS.driver", quartzDriverClass);
        properties.put("org.quartz.dataSource.IPDS.URL", quartzUrl);
        properties.put("org.quartz.dataSource.IPDS.user", quartzUsername);
        properties.put("org.quartz.dataSource.IPDS.password", quartzPassword);
        properties.put("org.quartz.dataSource.IPDS.maxConnections", "20");

Simple Trigger Code:
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SimpleTrigger tb = (SimpleTrigger) newTrigger()
.startAt(start) // some Date            .withSchedule(SimpleScheduleBuilder.simpleSchedule().withRepeatCount(0).withMisfireHandlingInstructionIgnoreMisfires())
.build();