cron获取上一个执行时间

 public static LocalDateTime getLastExecutionTime(LocalDateTime time, String cron) {
        CronParser parser = new CronParser(CronDefinitionBuilder.instanceDefinitionFor(CronType.QUARTZ));
        Cron quartzCron = parser.parse(cron);
        ExecutionTime executionTime = ExecutionTime.forCron(quartzCron);
        //获取给定时间的，上一次执行时间
        Optional<ZonedDateTime> st = executionTime.lastExecution(ZonedDateTime.of(time, ZoneId.systemDefault()));
        if (st != null) {
            return st.get().toLocalDateTime();
        }
        return null;
    }