function geboortedag() {
month = $('maand').selectedIndex;
month = $('maand').options[month].value;
day = $('dag').selectedIndex;
day = $('dag').options[day].value;
year = $('jaar').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]="Zondag";
weekday[2]="Maandag";
weekday[3]="Dinsdag";
weekday[4]="Woensdag";
weekday[5]="Donderdag";
weekday[6]="Vrijdag";
weekday[7]="Zaterdag";
if ( month == "January" ) month = "Januari";
if ( month == "February" ) month = "Februari";
if ( month == "March" ) month = "Maart";
if ( month == "April" ) month = "April";
if ( month == "May" ) month = "Mei";
if ( month == "June" ) month = "Juni";
if ( month == "July" ) month = "Juli";
if ( month == "August" ) month = "Augustus";
if ( month == "September" ) month = "September";
if ( month == "October" ) month = "Oktober";
if ( month == "November" ) month = "November";
if ( month == "December" ) month = "December";
if (day != date)
$('geboortedag').innerHTML = "
Deze datum klopt niet
";
else {
dayborn = weekday[theday];
dob = "" + dayborn + "
" + date + " " + month + " " + oyear + "";
$('geboortedag').innerHTML = "
U bent geboren op
" + dob + "
";
}
}