<script type="text/javascript">
function CalculateAge(birthday) {
var re=/^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d+$/;
if (birthday.value != '') {
if(re.test(birthday.value ))
{
birthdayDate = new Date(birthday.value);
dateNow = new Date();
var years = dateNow.getFullYear() - birthdayDate.getFullYear();
var months=dateNow.getMonth()-birthdayDate.getMonth();
var days=dateNow.getDate()-birthdayDate.getDate();
if (isNaN(years)) {
document.getElementById('lblAge').innerHTML = '';
document.getElementById('lblError').innerHTML = 'Input date is incorrect!';
return false;
}
else {
document.getElementById('lblError').innerHTML = '';
if(months < 0 || (months == 0 && days < 0)) {
years = parseInt(years) -1;
document.getElementById('lblAge').innerHTML = years +' Years '
}
else {
document.getElementById('lblAge').innerHTML = years +' Years '
}
}
}
else
{
document.getElementById('lblError').innerHTML = 'Date must be mm/dd/yyyy format';
return false;
}
}
}
</script>
