<script>function isleapyear(year){    if(parseInt(year)%4==0 && parseInt(year)%100!=0)return true;    if(parseInt(year)%400==0)return true;    return false;}function datedrift(date,difference){        var year=parseInt(date.getUTCFullYear()),        mon=parseInt(date.getUTCMonth())+1,        day=parseInt(date.getUTCDate());        sumdays=[31,59,90,120,151,181,212,243,273,304,334,365,31,60,91,121,152,182,213,244,274,305,335,366];    if(typeof difference!="string" || difference.length==0)return date;    var units=difference.match(/([+-]\d{1,3}[myd])/ig);    for(var i=0;i<units.length;i++)    {                if(units[i].charAt(0)==‘+‘)        {            var mark=units[i].substr(-1,1);            var value=http://www.mamicode.com/parseInt(units[i].substr(1,units[i].length-2));            if(mark ==‘y‘)            {                if(day<=28)                {                    year=year+value;                }                else if(day==29)                {                    year=year+value;                    if(mon==2)                    {                        if(!isleapyear(year))                            day=28;                    }                }                else                {                    year=year+value;                }            }            else if(mark == ‘m‘)            {                year+=Math.floor((value+mon)/12);                mon=(value+mon)%12;                if(day==29 && mon==2 && !isleapyear(year))day=28;                else if(day>=30 && mon==2)                {                    if(isleapyear(year))day=29;                    else day=28;                }                else if(day==31 && (mon==4 || mon==6 || mon==9 || mon==11))day=30;            }            else if(mark== ‘d‘)            {                year+=Math.floor((day+sumdays[(mon<3?(mon-1):(isleapyear(year)?(mon+11):(mon-1)))-1]+value)/365);                if(isleapyear(year))                {                    var days=((day+sumdays[(mon<3?(mon-1):(isleapyear(year)?(mon+11):(mon-1)))-1]+value)%365);                    if(days>=0 && days<31){mon=1;day=days==0?1:days}                    else if(days>=31 && days<60){mon=2;day=days==31?1:(days-31)}                    else if(days>=60 && days<91){mon=3;day=days==60?1:(days-60)}                    else if(days>=91 && days<121){mon=4;day=days==91?1:(days-91)}                    else if(days>=121 && days<152){mon=5;day=days==121?1:(days-121)}                    else if(days>=152 && days<182){mon=6;day=days==152?1:(days-152)}                    else if(days>=182 && days<213){mon=7;day=days==182?1:(days-182)}                    else if(days>=213 && days<244){mon=8;day=days==213?1:(days-213)}                    else if(days>=244 && days<274){mon=9;day=days==244?1:(days-244)}                    else if(days>=274 && days<305){mon=10;day=days==274?1:(days-274)}                    else if(days>=305 && days<335){mon=11;day=days==305?1:(days-305)}                    else if(days>=335 && days<=366){mon=12;day=days==335?1:(days-335)}                }                else                {                    var days=((day+sumdays[(mon<3?(mon-1):(isleapyear(year)?(mon+11):(mon-1)))-1]+value)%365);                    if(days>=0 && days<31){mon=1;day=days==0?1:days}                    else if(days>=31 && days<59){mon=2;day=days==31?1:(days-31)}                    else if(days>=59 && days<90){mon=3;day=days==59?1:(days-59)}                    else if(days>=90 && days<120){mon=4;day=days==90?1:(days-90)}                    else if(days>=120 && days<151){mon=5;day=days==120?1:(days-120)}                    else if(days>=151 && days<181){mon=6;day=days==151?1:(days-151)}                    else if(days>=181 && days<212){mon=7;day=days==181?1:(days-181)}                    else if(days>=212 && days<243){mon=8;day=days==212?1:(days-212)}                    else if(days>=243 && days<273){mon=9;day=days==243?1:(days-243)}                    else if(days>=273 && days<304){mon=10;day=days==273?1:(days-273)}                    else if(days>=304 && days<334){mon=11;day=days==304?1:(days-304)}                    else if(days>=334 && days<=365){mon=12;day=days==334?1:(days-334)}                }                            }        }        else        {        }    }    alert([year,mon,day]);}var curdate=new Date();datedrift(curdate,"+6m +3y +130d");</script>