java获取指定日期所在周的周一和周日-蒲公英云

java获取指定日期所在周的周一和周日

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())));
    }