获取每周第一天和最后一天

偏执的太偏执、 2022-06-01 07:46 420阅读 0赞

js:
    
    //第一种，测试可使用
    function getWeekDate(n){    
        var now=new Date();
        var year=now.getFullYear();
        //因为月份是从0开始的,所以获取这个月的月份数要加1才行
        var month=now.getMonth()+1;
        var date=now.getDate();
        var day=now.getDay();
        
        //判断是否为周日,如果不是的话,就让今天的day-1(例如星期二就是2-1)
        if(day!==0){
        n=n+(day-1);
        }
        else{
        n=n+day;
        }
        if(day){
        //这个判断是为了解决跨年的问题
        if(month>1){
        month=month;
        }
        //这个判断是为了解决跨年的问题,月份是从0开始的
        else{
        year=year-1;
        month=12;
        }
        }
        now.setDate(now.getDate()-n);
        year=now.getFullYear();
        month=now.getMonth()+1;
        date=now.getDate();
        
        s=year+"年"+(month<10?('0'+month):month)+"月"+(date<10?('0'+date):date)+"日";
        return s;
    }
    
    //设置本周开始结束日期   
        $('#current_week').html(getWeekDate(0) + "~" + getWeekDate(-6));
    
    
    ///第二种（未测试）
    var now = new Date(); //当前日期
    var nowDayOfWeek = now.getDay(); //今天本周的第几天
    var nowDay = now.getDate(); //当前日
    var nowMonth = now.getMonth(); //当前月
    var nowYear = now.getYear(); //当前年
    nowYear += (nowYear < 2000) ? 1900 : 0; //
    
    var lastMonthDate = new Date(); //上月日期
    lastMonthDate.setDate(1);
    lastMonthDate.setMonth(lastMonthDate.getMonth()-1);
    var lastYear = lastMonthDate.getYear();
    var lastMonth = lastMonthDate.getMonth();
    
    //格式化日期：yyyy-MM-dd
    function formatDate(date) {
    var myyear = date.getFullYear();
    var mymonth = date.getMonth()+1;
    var myweekday = date.getDate();
    if(mymonth < 10){
    mymonth = "0" + mymonth;
    }
    if(myweekday < 10){
    myweekday = "0" + myweekday;
    }
    return (myyear+"-"+mymonth + "-" + myweekday);
    }
    //获得本周的开始日期
    function getWeekStartDate() {
    var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
    return formatDate(weekStartDate);
    }
    //获得本周的结束日期
    function getWeekEndDate() {
    var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));
    return formatDate(weekEndDate);
    }

/** java
         * 获取当前日期所在周第一天和最后一天的日期
         * @return
         */
    	public static Map<String, String> getWeekDay() {
    		
    		Map<String, String> map = new HashMap<String, String>();
    		
    		Calendar cal = Calendar.getInstance();
    		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    		
    		//判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了  
    		int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天  
    		if(1 == dayWeek) {  
    			cal.add(Calendar.DAY_OF_MONTH, -1);  
    		}  
    		
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); // 获取本周一的日期
    		map.put("mon", df.format(cal.getTime()));
    		
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
    		cal.add(Calendar.WEEK_OF_YEAR, 1);
    		map.put("sun", df.format(cal.getTime()));
    		
    		return map;
    	}
    	
    	/**
    	 * 获取指定日期所在周第一天和最后一天的日期
    	 * @param currentDate
    	 * @return
    	 * @throws ParseException
    	 * @throws java.text.ParseException 
    	 */
    	public static Map<String, String> getWeekDay(String currentDate) throws ParseException{
    		
    		Map<String, String> map = new HashMap<String, String>();
    		
    		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    		Date date = df.parse(currentDate);
    		
    		Calendar cal = Calendar.getInstance();
    		
    		cal.setTime(date);
    		//判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了  
    		int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天  
    		if(1 == dayWeek) {  
    			cal.add(Calendar.DAY_OF_MONTH, -1);  
    		}  
    		
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); // 获取本周一的日期
    		map.put("mon", df.format(cal.getTime()));
    		
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
    		cal.add(Calendar.WEEK_OF_YEAR, 1);
    		map.put("sun", df.format(cal.getTime()));
    		
    		return map;
    	}