Javascript Date Picker

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function checkKeyCode(item)
{
  if(( (event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105) || (event.keyCode == 8) || (event.keyCode ==190) || (event.keyCode ==37) || (event.keyCode ==39) || (event.keyCode ==9) )&&( (item.value.length<=11) || (event.keyCode == 8))) {
    return true; 
  }
  else {
    return false;
  }
}

function createDate(input,output) {
    var str = input.value;
    var hata = 0;
    var istisna = 0;
    var d,m,y;
    var date = new Date();
    var month=new Array(12);
    month[0]="01";
    month[1]="02";
    month[2]="03";
    month[3]="04";
    month[4]="05";
    month[5]="06";
    month[6]="07";
    month[7]="08";
    month[8]="09";
    month[9]="10";
    month[10]="11";
    month[11]="12";
    
    str = str.substr(0,11);
    var strData = new Array();
    strData = str.split('.');
    
    if (strData[1]=='') {
        strData[1]=null;
        strData.length=1;
    }

    if (strData[2]=='') {
        strData[2]=null;
        strData.length=2;
    }

    if (strData.length==3) {
        if (strData[0].length == 2 && strData[1].length == 2 && strData[2].length == 4) {
                d = strData[0];
                m = strData[1];
                y = strData[2];
        }
        else {
            hata = 1;
        }
    }

    if (strData.length==2) {
        if (strData[0].length == 2 && strData[1].length == 2) {
            d = strData[0];
            m = strData[1];
            y = date.getFullYear();
        }
        else {
            hata = 1;
        }
    }

    if (strData.length==1) {
        if (strData[0].length>8 || strData[0].length<2) {
            hata = 1;
        }
        else {
            if (strData[0].length==2) {
                d = strData[0];
                m = month[date.getMonth()];
                y = date.getFullYear();
            }
            if (strData[0].length==4) {
                d = strData[0].substr(0,2);
                m = strData[0].substr(2,2);
                y = date.getFullYear();
            }
            if (strData[0].length==8) {
                d = strData[0].substr(0,2);
                m = strData[0].substr(2,2);
                y = strData[0].substr(4,4);
            }
        }
    }

    if ( (m!='01') && (m!='02') && (m!='03') && (m!='04') && (m!='05') && (m!='06') && (m!='07') && (m!='08') && (m!='09') && (m!='10') && (m!='11') && (m!='12') ) {
        hata=1;
    }
    else {

        if ((m=='01') || (m=='03') || (m=='05') || (m=='07') || (m=='08') || (m=='10') || (m=='12')) {
            if (d>31) {
                hata=1;
            }
        }

        if ((m=='04') || (m=='06') || (m=='09') || (m=='11')) {
            if (d>30) {
                hata=1;
            }
        }

        if (m=='02') {
            if (d>29) {
                hata=1;
            }
        }
    }

    if (hata==0) {
        output.value=y+'-'+m+'-'+d;
        input.value=d+'.'+m+'.'+y;
    }
    else {
        if (input.value!='') {
            alert("Hatalı Tarih: Tarihler dd.mm.yyyy veya ddmmyyyy şeklinde girilmelidir.");
            input.value='';
        }
    }
}

function initDate(hiddenBox,viewBox) {
    strHid = hiddenBox.value;
    hidArray = new Array();
    hidArray = strHid.split("-");
    y = hidArray[0];
    m = hidArray[1];
    d = hidArray[2];
    viewBox.value=d+"."+m+"."+y;
}