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Javascript Tebak Hari Lahir

<script language="JavaScript">

<!-- Begin
function calculate() {
month = document.form.month.selectedIndex;
month = document.form.month.options[month].value;
day = document.form.day.selectedIndex;
day = document.form.day.options[day].value;
year = document.form.year.value;

var oyear=year

var dob = " "+ year +", "+month + ",  "+day;
var thenx = new Date(dob);

var year=thenx.getYear();
if (year<100) year="19" + thenx.getYear();
else year=thenx.getYear();

if (year > 1969) wyear=year;
else {
if (oyear<1900) {
if (oyear>1800) {
wrelyear= (eval(oyear)-1801)%(28);
wyear = wrelyear+1981;
}
else wyear = 1970
}
else
if (oyear>1900) {wrelyear= (eval(oyear)-1901)%(28);
wyear= wrelyear+1985
}
else
if (oyear==1900) {wyear= 1990;
   }             
}
var dob = " "+ wyear +", "+month + ",  "+day;
var thenx = new Date(dob);

var theday = thenx.getDay()+1;
var date=thenx.getDate();

var weekday = new Array(6);
weekday[1]="Sunday";
weekday[2]="Monday";
weekday[3]="Tuesday";
weekday[4]="Wednesday";
weekday[5]="Thursday";
weekday[6]="Friday";
weekday[7]="Saturday";
if (day != date) alert("Sorry!  That appears to be an invalid date!"+day+" ..."+date+"::"+oyear+"..."+year+" "+dob+"=="+wyear+".-.-"+thenx+" "+day+" "+month);
else {
dayborn = weekday[theday];
dob = dayborn + ", " + month + " " + date + ", " + oyear + ".";
alert("You were born on " + dob);
   }
}
// End -->
</script>

<form name=”form”>
<center>
<table border=”2″ cellspacing=”0″ cellpadding=”0″ bgcolor=”blue”>
<tr><td colspan=”3″ align=”center”><font face=”verdana, arial” size=”-1″>When were you born?</font></td></tr>
<tr><td align=”center”>
<select name=”month”>
<option selected value=””/>Month
<option value=”January”/>Jan
<option value=”February”/>Feb
<option value=”March”/>Mar
<option value=”April”/>Apr
<option value=”May”/>May
<option value=”June”/>Jun
<option value=”July”/>Jul
<option value=”August”/>Aug
<option value=”September”/>Sep
<option value=”October”/>Oct
<option value=”November”/>Nov
<option value=”December”/>Dec
</select>
</td>
<td align=”center”>
<select name=”day”>
<option selected value=””/>Day
<option value=”1″/>01
<option value=”2″/>02
<option value=”3″/>03
<option value=”4″/>04
<option value=”5″/>05
<option value=”6″/>06
<option value=”7″/>07
<option value=”8″/>08
<option value=”9″/>09
<option value=”10″/>10
<option value=”11″/>11
<option value=”12″/>12
<option value=”13″/>13
<option value=”14″/>14
<option value=”15″/>15
<option value=”16″/>16
<option value=”17″/>17
<option value=”18″/>18
<option value=”19″/>19
<option value=”20″/>20
<option value=”21″/>21
<option value=”22″/>22
<option value=”23″/>23
<option value=”24″/>24
<option value=”25″/>25
<option value=”26″/>26
<option value=”27″/>27
<option value=”28″/>28
<option value=”29″/>29
<option value=”30″/>30
<option value=”31″/>31
</select>
</td>
<td align=”center”>
<input maxlength=”4″ value=”19″ name=”year” size=”4″ type=”text”/>
</td></tr>
</table><p>
<input value=”Calculate” onclick=”calculate()” type=”button”/>
</p></center>
</form>

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