Java 获取当前周，上一周，当前月份，上一月份，当前年份，上一年份的第一天最后一天日期

原创已于 2022-06-02 20:08:44 修改 · 1.6k 阅读

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于 2022-06-02 19:43:23 首次发布

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这段代码展示了如何使用Java的Calendar类获取当前日期所在周、上周、当前月、上月以及当前年份的首尾日期。通过add和set方法调整日期，以确定星期的第一天和最后一天，以及月份和年的边界。

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



public static void main(String[] args) {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(new Date());
    System.out.println("当前星期(日期)：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.DAY_OF_WEEK, 0);
    calendar.set(Calendar.DAY_OF_WEEK, 1);
    System.out.println("当前星期第一天(日期)：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.DAY_OF_WEEK, 1);
    calendar.set(Calendar.DAY_OF_WEEK, 0);
    System.out.println("当前星期最后一天(日期)：" + sdf.format(calendar.getTime()));

    System.out.println();

    calendar.setTime(new Date());
    calendar.add(Calendar.WEEK_OF_YEAR, -1);
    System.out.println("上周星期(日期)：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.DAY_OF_WEEK, 0);
    calendar.set(Calendar.DAY_OF_WEEK, 1);
    System.out.println("上周星期第一天(日期)：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.DAY_OF_WEEK, 1);
    calendar.set(Calendar.DAY_OF_WEEK, 0);
    System.out.println("上周星期最后一天(日期)：" + sdf.format(calendar.getTime()));

    System.out.println();

    calendar.setTime(new Date());
    System.out.println("当前月份：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.MONTH, 0);
    calendar.set(Calendar.DAY_OF_MONTH, 1);
    System.out.println("当前月份第一天：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DAY_OF_MONTH, 0);
    System.out.println("当前月份最后一天：" + sdf.format(calendar.getTime()));

    System.out.println();

    calendar.setTime(new Date());
    calendar.add(Calendar.MONTH, -1);
    System.out.println("上月月份：" + sdf.format(calendar.getTime()));
    calendar.set(Calendar.DAY_OF_MONTH, 1);
    System.out.println("上月月份第一天：" + sdf.format(calendar.getTime()));
    calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    System.out.println("上月月份最后一天：" + sdf.format(calendar.getTime()));

    System.out.println();

    calendar.setTime(new Date());
    System.out.println("当前年份：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.YEAR, 0);
    calendar.set(Calendar.DAY_OF_YEAR, 1);
    System.out.println("当前年份第一天：" + sdf.format(calendar.getTime()));
    calendar.add(Calendar.YEAR, 1);
    calendar.set(Calendar.DAY_OF_YEAR, 0);
    System.out.println("当前年份最后一天：" + sdf.format(calendar.getTime()));

    System.out.println();

    calendar.setTime(new Date());
    calendar.add(Calendar.YEAR, -1);
    System.out.println("上一年份：" + sdf.format(calendar.getTime()));
    calendar.set(Calendar.DAY_OF_YEAR, 1);
    System.out.println("上一年份第一天：" + sdf.format(calendar.getTime()));
    calendar.set(Calendar.DAY_OF_YEAR, calendar.getActualMaximum(Calendar.DAY_OF_YEAR));
    System.out.println("上一年份最后一天：" + sdf.format(calendar.getTime()));

}