7hutool实战:DateUtil(时间工具类)-日期计算

2022-01-06 1971

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简介： 7hutool实战:DateUtil(时间工具类)-日期计算

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

方法摘要

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);

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);

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);

    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);

    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