To check if age is not less than 13 years in javascript

Question

Can anyone please guide me through javascript function, which will fetch me year difference between current date and date entered by user

I have tried this, but it doesnot keep in count leap years

var yearOld=2000
var dateOld=11
var mnthOld=1;
var currendDate=new Date(); // 9 - jan - 2013

var oldDate=new Date(yearOld,mnthOld-1,dateOld);

var timeDiff =currendDate-oldDate ;

var diffDays = timeDiff / (1000 * 3600 * 24 * 365); 

Result is coming 13.00789 something where it should come less than 13

Any help will be appreciated

Answer 1

function getAge(birthDateString) {
    var today = new Date();
    var birthDate = new Date(birthDateString);
    var age = today.getFullYear() - birthDate.getFullYear();
    var m = today.getMonth() - birthDate.getMonth();
    if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
        age--;
    }
    return age;
}

if(getAge("27/06/1989") >= 18) {
    alert("You have 18 or more years old!");
} 

Answer 2

If you have good amount of Date related operations, consider using MomentJS http://momentjs.com/ . Check the first two examples there and i guess they fit your question.