很多方法，这里介绍两个很方便的实现

Demo1

 @Test
    public void tr(){
   
        final LocalDateTime fromDate = LocalDateTime.now();
        final LocalDateTime toDate = LocalDateTime.now().plusHours(56);

        long minutes = ChronoUnit.MINUTES.between(fromDate, toDate);
        long hours = ChronoUnit.HOURS.between(fromDate, toDate);

        System.out.println(minutes);
        System.out.println(hours);
// 3360
// 56
    }

Demo2

 @Test
    public void tr2(){
   
        final LocalDateTime fromDate = LocalDateTime.now();
        final LocalDateTime toDate = LocalDateTime.now().plusHours(56);

        final Duration duration = Duration.between(fromDate, toDate);

        final long minuts = duration.toMinutes();
        final long hours = duration.toHours();

        System.out.println(minuts);
        System.out.println(hours);

// 3360
// 56
    }

格式化操作如下,把项目代码粘过来了，直接用的java8的stream操作，还有hutool包，从Page对象中处理的逻辑，这里有更多Java8 Stream的操作

 Page<SyncRecordVo> vos = all.map(e -> JSONUtil.toBean(JSONUtil.toJsonStr(e), SyncRecordVo.class));
        vos.map(e -> {
   
            // todo 这里的时间差，这个操作必须要保证开始和结束都有时间！！！，怎么确定
                    e.setSyncTime(DateUtil.formatBetween(ChronoUnit.MILLIS.between(e.getStartTime(), e.getEndTime()), BetweenFormater.Level.SECOND));
                    if (e.getSyncStatus().equals(SyncEnum.SyncStatus.SYNC_FAIL.getKey())) {
   
                        e.setIsOperate(YesOrNoEnum.YES.getCode());
                    } else {
   
                        e.setIsOperate(YesOrNoEnum.NO.getCode());
                    }
                    return e;
                }
        );

这里的格式化意思是，将两个LocalDateTime的时间差，转成时分秒格式

12小时12分12秒