function start()
{
    document.form1.day.value = "";
    document.form1.month.value = "";
    document.form1.year.value = "";
    document.form1.age.value = "";
    document.form1.months.value = "";
    document.form1.weeks.value = "";
    document.form1.answer.value = "";
    document.form1.hours.value = "";
    document.form1.min.value = "";
    document.form1.sec.value = "";
    document.form1.bday.value = "";
    document.form1.milli.value = "";
}

function run()
{
    var ap;
    
    dd = document.form1.day.value;
    mm = document.form1.month.value;
    yy = document.form1.year.value;
    
    with(document.form1) 
    {
        ap = parseInt(ampm.selectedIndex);
        hr = parseInt(hrs.value);
        
        if(hr <= 0 && hr >= 13)
        {
            ap = null;
            alert("asdf")
        }
    }
    
    birthdate="valid";
    
    if ((mm < 1) || (mm > 12) || (dd < 1) || (dd > 31) || (yy < 1) ||(mm == "") || (dd == "") || (yy == ""))
    {
        birthdate = "Invalid";
    }
    else if (((mm == 4) || (mm == 6) || (mm == 9) || (mm == 11)) && (dd > 30))
    {
        birthdate = "Invalid";
    }
    else if (mm == 2)
    {
        if (dd > 29)
        {
            birthdate = "Invalid";
        }
        else if((dd > 28) && (!lyear(yy)))
        {
            birthdate="Invalid";
        }
    }
    else if((yy > 9999)||(yy < 0))
    {
        birthdate = "Invalid";
    }
    else
    {
        birthdate = birthdate;
    }
        
    if(birthdate == "valid")
    {
        function leapyear(a)
        {
            if(((a % 4 == 0) && (a % 100 != 0)) || (a % 400 == 0))
            {
                return true;
            }
            else 
            {
                return false;
            }
        }
        
        days = new Date();
        gdate = days.getDate();
        gmonth = days.getMonth();
        gyear = days.getYear();
        age = gyear - yy;

        if((mm == (gmonth + 1)) && (dd <= parseInt(gdate)))
        {
            age = age;
        }
        else
        {
            if(mm <= (gmonth))
            {
                age = age;
            }
            else
            {
                age = age - 1; 
            }
        }
    
        if(age == 0)
        {
            age = age;
        }
        
        document.form1.age.value="  You are " + age+ " years old & ";
        
        if(mm <= (gmonth + 1))
        {
            age = age - 1;
        }
        
        if((mm == (gmonth + 1)) && (dd > parseInt(gdate))) 
        {
            age = age + 1;
        }
        
        var m;
        var n;
        
        if (mm == 12) { n = 31 - dd; }
        if (mm == 11) { n = 61 - dd; }   
        if (mm == 10) { n = 92 - dd; }  
        if (mm == 9) { n = 122 - dd; } 
        if (mm == 8) { n = 153 - dd; }   
        if (mm == 7) { n = 184 - dd; }   
        if (mm == 6) { n = 214 - dd; }  
        if (mm == 5) { n = 245 - dd; } 
        if (mm == 4) { n = 275 - dd; } 
        if (mm == 3) { n = 306 - dd; }
        if (mm == 2) { n = 334 - dd; if(leapyear(yy)) n = n + 1; }
        if (mm == 1) { n = 365 - dd; if (leapyear(yy)) n = n + 1; }
        
        if (gmonth == 1) m = 31;
        if (gmonth == 2) { m = 59;   if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 3) { m = 90;   if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 4) { m = 120;  if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 5) { m = 151;  if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 6) { m = 181;  if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 7) { m = 212;  if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 8) { m = 243;  if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 9) { m = 273;  if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 10) { m = 304; if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 11) { m = 334; if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 12) { m = 365; if (leapyear(gyear)) m = m + 1; }
    
        totdays = (parseInt(age) * 365);
        totdays += age / 4;
        totdays = parseInt(totdays) + gdate + m + n;
        document.form1.answer.value = "" + totdays +" days ";
    
        months = age * 12;
        months += 12 - parseInt(mm);
        months += gmonth;
        document.form1.months.value = months + " Months";
    
        if (gmonth == 1) p = 31 + gdate;
        if (gmonth == 2) { p = 59 + gdate;   if (leapyear(gyear)) m = m + 1; }
        if (gmonth == 3) { p = 90 + gdate;   if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 4) { p = 120 + gdate;  if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 5) { p = 151 + gdate;  if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 6) { p = 181 + gdate;  if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 7) { p = 212 + gdate;  if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 8) { p = 243 + gdate;  if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 9) { p = 273 + gdate;  if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 10) { p = 304 + gdate; if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 11) { p = 334 + gdate; if (leapyear(gyear)) p = p + 1; }
        if (gmonth == 12) { p = 365 + gdate; if (leapyear(gyear)) p = p + 1; }

        weeks = totdays / 7;
        weeks += " weeks";
        weeks = parseInt(weeks);
        document.form1.weeks.value = weeks + " Weeks";

        var time = new Date();
        ghour = time.getHours();
        gmin = time.getMinutes();
        gsec = time.getSeconds();
        hour = ((age * 365) + n + p) * 24;
        hour += (parseInt(age / 4) * 24);
    
        if(ap == 0)
        {
            hour = hour - hr;
        }
        else
        {
            if(ap == 1)
            {
                hour = hour - (11 + hr)
            }
        }
        
        document.form1.hours.value = hour + " Hours";
    
        var min;
        min = (hour * 60) + gmin;
        document.form1.min.value = min + " Minutes";

        sec = (min * 60) + gsec;
        document.form1.sec.value = sec + " Seconds";

        var millisec;
        var gmil;
        gmil = days.getMilliseconds();
        millisec = (sec * 1000) + gmil;
        document.form1.milli.value = millisec + " Milliseconds";

        mm = mm - 1;
        var r;
        
        if(mm == 0) r = 1;
        if(mm == 1) r = 31;
        if(mm == 2) { r = 59;    if (leapyear(gyear)) m = m + 1; }
        if(mm == 3) { r = 90;    if (leapyear(gyear)) r = r + 1; }
        if(mm == 4) { r = 120;   if (leapyear(gyear)) r = r + 1; }
        if(mm == 5) { r = 151;   if (leapyear(gyear)) r = r + 1; }
        if(mm == 6) { r = 181;   if (leapyear(gyear)) r = r + 1; }
        if(mm == 7) { r = 212;   if (leapyear(gyear)) r = r + 1; }
        if(mm == 8) { r = 243;   if (leapyear(gyear)) r = r + 1; }
        if(mm == 9) { r = 273;   if (leapyear(gyear)) r = r + 1; }
        if(mm == 10) { r = 304;  if (leapyear(gyear)) r = r + 1; }
        if(mm == 11) { r = 334;  if (leapyear(gyear)) r = r + 1; }
        if(mm == 12) { r = 365;  if (leapyear(gyear)) r = r + 1; }

        mm = mm + 1;
        r = parseInt(r) + parseInt(dd);

        if( mm > (gmonth + 1))
        {
            bday = r - m - gdate;
        }
        else
        {
            if(mm == (gmonth + 1) && (gdate < dd))
            {
                bday = (r - m - gdate);
            }
            else
            {
                if((leapyear(gyear)) && ((mm > 2) && (dd < 29)))
                {
                    a = 366;
                }
                else
                {
                    a = 365; 
                }
                bday = a + (r - m - gdate);
            }
        }
        
        nhour = 24-parseInt(ghour);
        nmin = 60 - parseInt(gmin);
        nsec = 60 - parseInt(gsec);

        go();

        if(((bday == 366) && (leapyear(yy))) || ((bday == 365) && (!leapyear(yy))))
        {
            document.form1.bday.value = "today is your birthday";
            alert("Happy Birthday");
        }
        else
        {
            document.form1.bday.value = bday + " days " + nhour + " hours " + nmin + " minutes " + nsec + " seconds";
            setTimeout("run()", 1);
        }
    
        function go()
        {
            function lyear(a)
            {
                if(((a % 4 == 0) && (a % 100 != 0)) || (a % 400 == 0)) 
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            
            mm = parseInt(mm);
            dd = parseInt(dd);
            yy = parseInt(yy);
        
            if ((mm < 1) || (mm > 12) || (dd < 1) || (dd > 31) || (yy < 1) ||(mm == " ") || (dd == " ") || (yy == " "))
            {
                birthdate="Invalid";
            }
            else if (((mm == 4) || (mm == 6) || (mm == 9) || (mm == 11)) && (dd > 30)) 
            {
                birthdate = "Invalid";
            }
            else if (mm == 2)
            {
                if (dd > 29)
                {
                    birthdate = "Invalid";
                }
                else if(( dd > 28) && (!lyear(yy)))
                {
                    birthdate = "Invalid";
                }
            }
            else
            {
                birthdate = birthdate;
            }
            
            if(birthdate == "valid")
            {
                var m;
                
                if (mm == 1) n = 31;
                if (mm == 2) n = 59 + 1;
                if (mm == 3) n = 90 + 1;
                if (mm == 4) n = 120 + 1;
                if (mm == 5) n = 151 + 1;
                if (mm == 6) n = 181 + 1;
                if (mm == 7) n = 212 + 1;
                if (mm == 8) n = 243 + 1;
                if (mm == 9) n = 273 + 1;
                if (mm == 10) n = 304 + 1;
                if (mm == 11) n = 334 + 1;
                if (mm == 12) n = 365 + 1;
                
                if((mm == 1)||(mm == 3)||(mm == 5)||(mm == 7)||(mm == 8)||(mm == 10)||(mm == 12))
                {
                    n += 31 + dd;
                }
                else if((mm == 4)||(mm == 6)||(mm == 9)||(mm == 11))
                {
                    n += 31 + dd + 1;
                }
                else if(mm == 2)
                {
                    if(lyear(yy))
                    {
                        n += 29 + dd - 3;
                    }
                    else if(!lyear(yy))
                    {
                        n += 28 + dd - 1;
                    }
                }
        
                fours = yy / 4;
                hunds = yy / 100;
                fhunds = yy / 400;
                
                var day;
                day = (yy + n + fours - hunds + fhunds) % 7;
                day = parseInt(day)
            
                switch(day)
                {
                    case 1 : document.form1.age.value +=" you were born on a Sunday"
                        break
                    case 2 : document.form1.age.value +=" you were born on a Monday"
                        break
                    case 3 : document.form1.age.value +=" you were born on a Tuesday"
                        break
                    case 4 : document.form1.age.value +=" you were born on a Wednesday"
                        break
                    case 5 : document.form1.age.value +=" you were born on a Thursday"
                        break
                    case 6 : document.form1.age.value +=" you were born on a Friday"
                        break
                    case 7 : document.form1.age.value +=" you were born on a Saturday"
                        break
                    case 0 : document.form1.age.value +=" you were born on a Saturday"
                        break
                }
            }
            else
            {
                document.form1.age.value += birthdate + " Date";
            }
        }
    }
    else
    {
        document.form1.age.value = birthdate + " Date";
        document.form1.months.value = "";
        document.form1.weeks.value = "";
        document.form1.answer.value = "";
        document.form1.hours.value = "";
        document.form1.min.value = "";
        document.form1.sec.value = "";
        document.form1.bday.value = "";
        document.form1.milli.value = "";
   }
}