7hutool实战:DateUtil(时间工具类)-日期计算

2021-08-20 01:06:43

hutool实战（带你掌握里面的各种工具）目录

万字博文教你搞懂java源码的日期和时间相关用法

用途：日期计算

使用场景

包含日期的各种计算方式

项目引用

此博文的依据：hutool-5.6.5版本源码 7hutool实战:DateUtil(时间工具类)-日期计算

方法摘要

7hutool实战:DateUtil(时间工具类)-日期计算

返回值:

日期差

参考案例:

        String dateStr1 = "2017-03-01 22:34:23";
        Date date1 = DateUtil.parse(dateStr1);

        String dateStr2 = "2017-04-01 23:56:14";
        Date date2 = DateUtil.parse(dateStr2);

        // 相差月
        long betweenMonth = DateUtil.betweenMonth(date1, date2, false);
        Assert.assertEquals(1, betweenMonth);// 相差一个月
        // 反向
        betweenMonth = DateUtil.betweenMonth(date2, date1, false);
        Assert.assertEquals(1, betweenMonth);// 相差一个月

        // 相差天
        long betweenDay = DateUtil.between(date1, date2, DateUnit.DAY);
        Assert.assertEquals(31, betweenDay);// 相差一个月，31天
        // 反向
        betweenDay = DateUtil.between(date2, date1, DateUnit.DAY);
        Assert.assertEquals(31, betweenDay);// 相差一个月，31天

        // 相差小时
        long betweenHour = DateUtil.between(date1, date2, DateUnit.HOUR);
        Assert.assertEquals(745, betweenHour);
        // 反向
        betweenHour = DateUtil.between(date2, date1, DateUnit.HOUR);
        Assert.assertEquals(745, betweenHour);

        // 相差分
        long betweenMinute = DateUtil.between(date1, date2, DateUnit.MINUTE);
        Assert.assertEquals(44721, betweenMinute);
        // 反向
        betweenMinute = DateUtil.between(date2, date1, DateUnit.MINUTE);
        Assert.assertEquals(44721, betweenMinute);

        // 相差秒
        long betweenSecond = DateUtil.between(date1, date2, DateUnit.SECOND);
        Assert.assertEquals(2683311, betweenSecond);
        // 反向
        betweenSecond = DateUtil.between(date2, date1, DateUnit.SECOND);
        Assert.assertEquals(2683311, betweenSecond);

        // 相差秒
        long betweenMS = DateUtil.between(date1, date2, DateUnit.MS);
        Assert.assertEquals(2683311000L, betweenMS);
        // 反向
        betweenMS = DateUtil.between(date2, date1, DateUnit.MS);
        Assert.assertEquals(2683311000L, betweenMS);
        long between = DateUtil.between(DateUtil.parse("2019-05-06 02:15:00"), DateUtil.parse("2019-05-06 02:20:00"), DateUnit.HOUR);
        Assert.assertEquals(0, between);

7hutool实战:DateUtil(时间工具类)-日期计算

返回值:

日期差

参考案例:

        long between = DateUtil.between(DateUtil.parse("2021-05-18 22:15:00"), DateUtil.parse("2021-05-18 21:15:00"), DateUnit.HOUR,true);
        Assert.assertEquals(1, between);

7hutool实战:DateUtil(时间工具类)-日期计算

返回值:

日期差

参考案例:

        //判断两个日期相差的毫秒数
        long between = DateUtil.betweenMs(DateUtil.parse("2021-05-18 22:15:00"), DateUtil.parse("2021-05-18 21:15:00"));
        Assert.assertEquals(60*60*1000, between);

7hutool实战:DateUtil(时间工具类)-日期计算

        long betweenYear = DateUtil.betweenYear(DateUtil.parse("2021-05-18 22:15:00"), DateUtil.parse("2020-05-18 21:15:00"),true);
        Assert.assertEquals(1, betweenYear);

        betweenYear = DateUtil.betweenYear(DateUtil.parse("2020-05-18 22:15:00"), DateUtil.parse("2021-05-18 22:15:00"),true);
        Assert.assertEquals(1, betweenYear);

        betweenYear = DateUtil.betweenYear(DateUtil.parse("2020-05-18 22:15:00"), DateUtil.parse("2021-05-18 21:15:00"),false);
        Assert.assertEquals(0, betweenYear);

        betweenYear = DateUtil.betweenYear(DateUtil.parse("2020-05-18 22:15:00"), DateUtil.parse("2021-05-19 22:15:00"),false);
        Assert.assertEquals(1, betweenYear);

        betweenYear = DateUtil.betweenYear(DateUtil.parse("2020-05-18 22:15:00"), DateUtil.parse("2021-04-18 22:15:00"),false);
        Assert.assertEquals(0, betweenYear);

7hutool实战:DateUtil(时间工具类)-日期计算

        TimeInterval timer = DateUtil.timer(false);

        // ---------------------------------
        // -------这是执行过程
        // ---------------------------------

        timer.interval();// 花费毫秒数
        timer.intervalRestart();// 返回花费时间，并重置开始时间
        timer.intervalMinute();// 花费分钟数