這個其實網上有很多例子，都是直接用js在前端做了時間處理，我的處理也一樣，想要變成2008-3-31，就用下面的js直接可以處理

    function Todate(num) { //Fri Oct 31 18:00:00 UTC+0800 2008
        num = num + "";
        var date = "";
        var month = new Array();
        month["Jan"] = 1; month["Feb"] = 2; month["Mar"] = 3; month["Apr"] = 4; month["May"] = 5; month["Jun"] = 6;
        month["Jul"] = 7; month["Aug"] = 8; month["Sep"] = 9; month["Oct"] = 10; month["Nov"] = 11; month["Dec"] = 12;
        var week = new Array();
        week["Mon"] = "一"; week["Tue"] = "二"; week["Wed"] = "三"; week["Thu"] = "四"; week["Fri"] = "五"; week["Sat"] = "六"; week["Sun"] = "日";
        str = num.split(" ");
        date = str[5] + "-";
        date = date + month[str[1]] + "-" + str[2];//獲取到的年月日，要是想加上時分秒，就date = date + month[str[1]] + "-" + str[2]+ " " + str[3];
        return date;
    }

我正好做項目，時間要轉換成2008-03，我就直接加了個判斷

function spliceZero(param)
		{
		    if (param < 10) {
		    param = "0" + param;
		}
		    return param;
		} 


/**
*  下面給個完整的例子
*
**/


function Todate(num) { //Fri Oct 31 18:00:00 UTC+0800 2008
            if(num!=""){
                num = num + "";
                var date = "";
                var month = new Array();
                month["Jan"] = 1; month["Feb"] = 2; month["Mar"] = 3; month["Apr"] = 4; month["May"] = 5; month["Jun"] = 6;
                month["Jul"] = 7; month["Aug"] = 8; month["Sep"] = 9; month["Oct"] = 10; month["Nov"] = 11; month["Dec"] = 12;
                str = num.split(" ");
                date = str[5] + "-";
                date = date + spliceZero(month[str[1]]);
                return date;
            }else{
                 return "";
            }
            
        }
        
        function spliceZero(param)
        {
            if (param < 10) {
            param = "0" + param;
        }
            return param;
        } 

Fri Oct 31 18:00:00 UTC+0800 2008轉換為yyyy-mm-dd