java获取指定日期所在周的周一和周日

2022-11-20 06:58 930阅读 0赞

获取指定日期所在周的周一：

/** * 获取指定日期所在周的周一 * * @param date 日期 */
        public static Date getFirstDayOfWeek(Date date) { 
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            if (c.get(Calendar.DAY_OF_WEEK) == 1) { 
                c.add(Calendar.DAY_OF_MONTH, -1);
            }
            c.add(Calendar.DATE, c.getFirstDayOfWeek() - c.get(Calendar.DAY_OF_WEEK) + 1);
            return c.getTime();
        }

获取指定日期所在周的周日：

/** * 获取指定日期所在周的周日 * * @param date 日期 */
        public static Date getLastDayOfWeek(Date date) { 
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            // 如果是周日直接返回
            if (c.get(Calendar.DAY_OF_WEEK) == 1) { 
                return date;
            }
            //System.out.println(c.get(Calendar.DAY_OF_WEEK));
            c.add(Calendar.DATE, 7 - c.get(Calendar.DAY_OF_WEEK) + 1);
            return c.getTime();
        }

测试：

public static void main(String[] args) { 
    		Calendar c = Calendar.getInstance();
    		c.setTime(new Date());
    		c.add(Calendar.DATE, 3);
    		SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    		System.out.println("当前日期：" + sf.format(c.getTime()));
    		System.out.println(sf.format(getFirstDayOfWeek(c.getTime())));
    		System.out.println(sf.format(getLastDayOfWeek(c.getTime())));
    	}

结果：  
![在这里插入图片描述][20201030142249360.png_pic_center]

参考：[https://www.jianshu.com/p/b3bdd6c34e66][https_www.jianshu.com_p_b3bdd6c34e66]

[20201030142249360.png_pic_center]: /images/20221120/df2b2f978ecd4be8be1588d431ef9421.png
[https_www.jianshu.com_p_b3bdd6c34e66]: https://www.jianshu.com/p/b3bdd6c34e66