LocalDateTime now = LocalDateTime.now();
System.out.println("计算两个时间的差：");
LocalDateTime end = LocalDateTime.now();
Duration duration = Duration.between(now,end);
long days = duration.toDays(); //相差的天数
long hours = duration.toHours();//相差的小时数
long minutes = duration.toMinutes();//相差的分钟数
long millis = duration.toMillis();//相差毫秒数
long nanos = duration.toNanos();//相差的纳秒数
System.out.println(now);
System.out.println(end);
System.out.println("发送短信耗时【 "+days+"天："+hours+" 小时："+minutes+" 分钟："+millis+" 毫秒："+nanos+" 纳秒】");