# 相差秒数
Instant start = Instant.now();
Thread.sleep(3000L);
Instant end = Instant.now();
Duration duration = Duration.between(start, end);
System.out.println(duration.getSeconds());
//添加1天
Duration begin = Duration.ZERO;
Duration after1Days = begin.plusDays(1);
//86400s
System.out.println(after1Days.getSeconds());
