js 转化为标准日期型

function NLDate_parseString(sDate, bDoAlert)
{
    var m=0;
    var d=0;
    var y=0;
    var val = sDate;
    var fmterr = "";
    var year="";
    var year_char_index, month_char_index, day_char_index;
    var rtnDate = null;

    if(!window.dateformat)
        window.dateformat = "MM/DD/YYYY";   

    if(sDate == "")
    {
        return new Date();
    }
    else if(window.dateformat == "MM/DD/YYYY")
    {
        if (val.indexOf("/") != -1)
        {
            var c = val.split("/");
            if(onlydigits(c[0])) m = parseInt(c[0],10);
            if(onlydigits(c[1])) d = parseInt(c[1],10);
    
            if ( d > 1970 )
            {
                year = y = d;
                d = 1;
            }
            else
            {
                if(onlydigits(c[2])) y = parseInt(c[2],10);
                year=c[2];
            }
        }
        else
        {
            var l = val.length, str;
            str = val.substr(0,2-l%2); if(onlydigits(str)) m = parseInt(str,10);
            str = val.substr(2-l%2,2); if(onlydigits(str)) d = parseInt(str,10);
            str = val.substr(4-l%2);   if(onlydigits(str)) y = parseInt(str,10);
            year=str;
        }
    }
    else if(window.dateformat == "DD/MM/YYYY")
    {
        if (val.indexOf("/") != -1)
        {
            var c = val.split("/");
            if(onlydigits(c[0])) d = parseInt(c[0],10);
            if(onlydigits(c[1])) m = parseInt(c[1],10);
            if(onlydigits(c[2])) y = parseInt(c[2],10);
            year=c[2];
        }
        else
        {
            var l = val.length, str;
            str = val.substr(0,2-l%2); if(onlydigits(str)) d = parseInt(str,10);
            str = val.substr(2-l%2,2); if(onlydigits(str)) m = parseInt(str,10);
            str = val.substr(4-l%2);   if(onlydigits(str)) y = parseInt(str,10);
            year=str;
        }
    }
    else if(window.dateformat == "YYYY/MM/DD")
    {
        if (val.indexOf("/") != -1)
        {
            var c = val.split("/");
            if(onlydigits(c[0])) y = parseInt(c[0],10);
            if(onlydigits(c[1])) m = parseInt(c[1],10);
            if(onlydigits(c[2])) d = parseInt(c[2],10);
            year=c[0];
        }
        else
        {
            var l = val.length, str;
            str = val.substr(0,2-l%2); if(onlydigits(str)) y = parseInt(str,10);
            str = val.substr(2-l%2,2); if(onlydigits(str)) m = parseInt(str,10);
            str = val.substr(4-l%2);   if(onlydigits(str)) d = parseInt(str,10);
            year=str;
        }
    }
    else if(window.dateformat == "DD.MM.YYYY")
    {
        if (val.indexOf(".") != -1)
        {
            var c = val.split(".");
            if(onlydigits(c[0])) d = parseInt(c[0],10);
            if(onlydigits(c[1])) m = parseInt(c[1],10);
            if(onlydigits(c[2])) y = parseInt(c[2],10);
            year=c[2];
        }
        else
        {
            var l = val.length, str;
            str = val.substr(0,2-l%2); if(onlydigits(str)) d = parseInt(str,10);
            str = val.substr(2-l%2,2); if(onlydigits(str)) m = parseInt(str,10);
            str = val.substr(4-l%2);   if(onlydigits(str)) y = parseInt(str,10);
            year=parseInt(str,10);
        }
    }
    else if(window.dateformat == "DD-Mon-YYYY")
    {
        if (val.indexOf("-") != -1)
        {
            var c = val.split("-");
            if(onlydigits(c[0])) d = parseInt(c[0],10);
            m = getMonthIndex(c[1]);
            <!--alert('month index....'+m+','+c[1]);-->
            if(onlydigits(c[2])) y = parseInt(c[2],10);
            year=c[2];
        }
        else
        {
            var l = val.length, str;
            str = val.substr(0,1+l%2); if(onlydigits(str)) d = parseInt(str,10);
            str = val.substr(1+l%2,3);
            m = getMonthIndex(str);
            str = val.substr(4+l%2);   if(onlydigits(str)) y = parseInt(str,10);
            year=str;
        }
    }
    else if(window.dateformat == "DD-MONTH-YYYY")
    {
        var comps = val.split("-");
        if(onlydigits(comps[0]))
            d = parseInt(comps[0]);
        m = arrayIndexOf(NLDate_months, comps[1], true) + 1;
        if(onlydigits(comps[2]))
        {
            y = parseInt(comps[2]);
            year = y;
        }
    }
    else if(window.dateformat == "YYYY-MM-DD")
    {
        var comps = val.split("-");
        if(onlydigits(comps[2]))
            d = parseInt(comps[2]);
        if(onlydigits(comps[1]))
            m = parseInt(comps[1]);
        if(onlydigits(comps[0]))
        {
            y = parseInt(comps[0]);
            year = y;
        }
    }
        else if(window.dateformat == "EEYY年MM月DD日")
    {
        year_char_index = val.indexOf(year_char_cn);
        month_char_index = val.indexOf(month_char_cn);
        day_char_index = val.indexOf(day_char_cn);
        if(onlydigits(val.substring(month_char_index+1,day_char_index)))
            d = parseInt(val.substring(month_char_index+1,day_char_index));
        if(onlydigits(val.substring(year_char_index+1,month_char_index)))
            m = parseInt(val.substring(year_char_index+1,month_char_index));
        var era = val.substring(0, 2);
        if(onlydigits(val.substring(2,year_char_index)))
        {
            y = get_gregorian_year(parseInt(val.substring(2,year_char_index)), era);
            year = y;
        }
    }
        else if(window.dateformat == "YYYY年MM月DD日")
    {
        year_char_index = val.indexOf(year_char_cn);
        month_char_index = val.indexOf(month_char_cn);
        day_char_index = val.indexOf(day_char_cn);
        if(onlydigits(val.substring(month_char_index+1,day_char_index)))
            d = parseInt(val.substring(month_char_index+1,day_char_index));
        if(onlydigits(val.substring(year_char_index+1,month_char_index)))
            m = parseInt(val.substring(year_char_index+1,month_char_index));
        if(onlydigits(val.substring(0,year_char_index)))
        {
            y = parseInt(val.substring(0,year_char_index));
            year = y;
        }
    }
    else if(window.dateformat == "EYY.MM.DD")
    {
        comps = val.split(".");
        if(onlydigits(comps[2]))
            d = parseInt(comps[2]);
        if(onlydigits(comps[1]))
            m = parseInt(comps[1]);
        var era = comps[0].substring(0, 1);
        if(onlydigits(comps[0].substring(1,comps[0].length)))
        {
            y = get_gregorian_year(parseInt(comps[0].substring(1,comps[0].length)), era);
            year = y;
        }
    }
    else if(window.dateformat == "DD. Mon YYYY")
    {
        comps = val.split(" ");
        if(onlydigits(comps[0].substring(0, comps[0].length - 1)))
            d = parseInt(comps[0].substring(0, comps[0].length - 1));
        m = getMonthIndex(comps[1]);
        if(onlydigits(comps[2]))
        {
            y = parseInt(comps[2]);
            year = y;
        }
    }
    else if(window.dateformat == "DD de MONTH de YYYY")
    {
        comps = val.split(" de ");
        if(onlydigits(comps[0]))
            d = parseInt(comps[0]);
        m = arrayIndexOf(NLDate_months, comps[1]) + 1;
        if(onlydigits(comps[2]))
        {
            y = parseInt(comps[2]);
            year = y;
        }
    }
        else if(window.dateformat == "YYYY년 MM월 DD일")
    {
        comps = val.split(" ");
        if(onlydigits(comps[2].substring(0, comps[2].length-1)))
            d = parseInt(comps[2].substring(0, comps[2].length-1));
        if(onlydigits(comps[1].substring(0, comps[1].length-1)))
            m = parseInt(comps[1].substring(0, comps[1].length-1)) - 1;
        if(onlydigits(comps[0].substring(0, comps[0].length-1)))
        {
            y = parseInt(comps[0].substring(0, comps[0].length-1));
            year = y;
        }
    }
        else if(window.dateformat == "DD MONTH YYYY")
        {
                comps = val.split(" ");
                if(onlydigits(comps[0]))
                        d = parseInt(comps[0]);
                m = arrayIndexOf(NLDate_months, comps[1], true) + 1;
                if(onlydigits(comps[2]))
                {
                        y = parseInt(comps[2]);
                        year = y;
                }
        }
        else if(window.dateformat == "DD MONTH, YYYY")
        {
                comps = val.split(" ");
                if(onlydigits(comps[0]))
                        d = parseInt(comps[0]);
                m = arrayIndexOf(NLDate_months, comps[1].substring(0, comps[1].length-1), true) + 1;
                if(onlydigits(comps[2]))
                {
                        y = parseInt(comps[2]);
                        year = y;
                }
        }

    if(m==0 || d==0)
    {
        if(bDoAlert)
        {
            if(fmterr == "")
                fmterr = window.dateformat;
            alert("无效日期值（必须为"+window.dateformat+"）");
        }
    }
    else
    {
        if (y==0 && !onlydigits(year)) y = (new Date()).getFullYear();  
        if(m<1) m=1; else if(m>12) m=12;
        if(d<1) d=1; else if(d>31) d=31;
        if(y<100) y+=((y>=70)?1900:2000);
        if(y<1000) y*=10;
        if (y > 9999) y = (new Date()).getFullYear();

        year = y;
                rtnDate = validateDate(new Date(y, m-1, d), bDoAlert);
    }

    return rtnDate;
}