function netscapeKeyPress(e) {

    if (e.which == 13)

        Calculate_Form();

}



function microsoftKeyPress() {

    if (window.event.keyCode == 13)

        Calculate_Form();

}



if (navigator.appName == 'Netscape') {

    window.captureEvents(Event.KEYPRESS);

    window.onKeyPress = netscapeKeyPress;

}



function y2k(number) { return (number < 1000) ? number + 1900 : number; }

var weekday = new Array("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday");



function Reset_Result() {

  document.Form_Day_Week_Number.day_result.value = "";

  document.Form_Day_Week_Number.week_result.value = "";

  document.Form_Day_Week_Number.weekday_result.value = "";

}



function Calculate_Form() {

  var date_format = "%m/%d/%y";

  var theDate;

  with (document.Form_Day_Week_Number) {

    theDate = buildDate(the_date.value,date_format);

  }



  if (!(typeof theDate == "object")) {

    alert("The Date entered is not in a valid format!!");

    return;

  }



	// This code calculates the day number

function makeArray()    {

    this[0] = makeArray.arguments.length;

    for (i = 0; i<makeArray.arguments.length; i++)

        this[i+1] = makeArray.arguments[i];

}



var accumulate    = new makeArray(  0, 31, 59, 90,120,151,181,212,243,273,304,334);

var accumulateLY  = new makeArray(  0, 31, 60, 91,121,152,182,213,244,274,305,335);



function LeapYear(year) {

    if ((year/4)   != Math.floor(year/4))   return false;

    if ((year/100) != Math.floor(year/100)) return true;

    if ((year/400) != Math.floor(year/400)) return false;

    return true;

}



function getJulian(day,month,year) {

    if (LeapYear(year))

        return (day + accumulateLY[month]);

    else

        return (day + accumulate[month]);

}

	// End code to calculate the day Number



	// Code to calculate week number

function getWeek(day,month,year) {

	//year = y2k(year);

    var when = new Date(year,month,day);

    var newYear = new Date(year,0,1);

    var offset = 7 + 1 - newYear.getDay();

    if (offset == 8) offset = 1;

    var daynum = ((Date.UTC(y2k(year),when.getMonth(),when.getDate(),0,0,0) - Date.UTC(y2k(year),0,1,0,0,0)) /1000/60/60/24) + 1;

    var weeknum = Math.floor((daynum-offset+7)/7);

    if (weeknum == 0) {

        year--;

        var prevNewYear = new Date(year,0,1);

        var prevOffset = 7 + 1 - prevNewYear.getDay();

        if (prevOffset == 2 || prevOffset == 8) weeknum = 53; else weeknum = 52;

    }

    return weeknum;

}

	// End code to calculate week number



// Code to calculate Eur weeknumber

function getWeekEUR(day,month,year) {

    var when = new Date(year,month,day);

    var newYear = new Date(year,0,1);

    var modDay = newYear.getDay();

    if (modDay == 0) modDay=6; else modDay--;



    var daynum = ((Date.UTC(y2k(year),when.getMonth(),when.getDate(),0,0,0) -

                 Date.UTC(y2k(year),0,1,0,0,0)) /1000/60/60/24) + 1;



    if (modDay < 4 ) {

        var weeknum = Math.floor((daynum+modDay-1)/7)+1;

    }

    else {

        var weeknum = Math.floor((daynum+modDay-1)/7);

        if (weeknum == 0) {

            year--;

            var prevNewYear = new Date(year,0,1);

            var prevmodDay = prevNewYear.getDay();

            if (prevmodDay == 0) prevmodDay = 6; else prevmodDay--;

            if (prevmodDay < 4) weeknum = 53; else weeknum = 52;

        }

    }



    return + weeknum;

}

// End Eur weeknumber





  document.Form_Day_Week_Number.day_result.value = getJulian(theDate.getDate(),theDate.getMonth()+1,theDate.getYear());

  document.Form_Day_Week_Number.week_result.value = getWeek(theDate.getDate(),theDate.getMonth(),theDate.getYear());

  document.Form_Day_Week_Number.week_result_eur.value = getWeekEUR(theDate.getDate(),theDate.getMonth(),theDate.getYear());

  document.Form_Day_Week_Number.weekday_result.value = weekday[theDate.getDay()];

}