Java获取当天、本周、本月 开始及结束时间（Calendar.getInstance()）

Java获取当天、本周、本月 开始及结束时间

package test2.日期;

import java.util.Calendar;
import java.util.Date;

/**
 * Java获取当天、本周、本月 开始及结束时间
 */
public class Test1 {
    public static void main(String[] args) {
        System.out.println("当前时间：" + new Date().toLocaleString());
        System.out.println("当天0点时间：" + getTimesmorning().toLocaleString());
        System.out.println("当天24点时间：" + getTimesnight().toLocaleString());
        System.out.println("本周周一0点时间：" + getTimesWeekmorning().toLocaleString());
        System.out.println("本周周日24点时间：" + getTimesWeeknight().toLocaleString());
        System.out.println("本月初0点时间：" + getTimesMonthmorning().toLocaleString());
        System.out.println("本月未24点时间：" + getTimesMonthnight().toLocaleString());
    }

    // 获得当天0点时间
    public static Date getTimesmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    // 获得当天24点时间
    public static Date getTimesnight() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 24);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    // 获得本周一0点时间
    public static Date getTimesWeekmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        return cal.getTime();
    }

    // 获得本周日24点时间
    public static Date getTimesWeeknight() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getTimesWeekmorning());
        cal.add(Calendar.DAY_OF_WEEK, 7);
        return cal.getTime();
    }

    // 获得本月第一天0点时间
    public static Date getTimesMonthmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
        return cal.getTime();
    }

    // 获得本月最后一天24点时间
    public static Date getTimesMonthnight() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, 24);
        return cal.getTime();
    }

}

运行结果：

"C:\Program Files\Java\jdk1.8.0_201\bin\java.exe" "-javaagent:D:\software\IntelliJ IDEA 2020.3\lib\idea_rt.jar=61302:D:\software\IntelliJ IDEA 2020.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_201\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\rt.jar;D:\idea-workspace\untitledTest\out\production\untitledTest;D:\Users\maven-repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;D:\Users\maven-repository\com\baomidou\mybatis-plus-annotation\3.1.0\mybatis-plus-annotation-3.1.0.jar" test2.日期.Test1
当前时间：2021-3-1 10:31:40
当天0点时间：2021-3-1 0:00:00
当天24点时间：2021-3-2 0:00:00
本周周一0点时间：2021-3-1 0:00:00
本周周日24点时间：2021-3-8 0:00:00
本月初0点时间：2021-3-1 0:00:00
本月未24点时间：2021-4-1 0:00:00

进程已结束,退出代码0