Using JavaScript to calculate age

In the below example the field [CustomerDOB] is entered into the script in DD/MM/YYYY format, the [CustomerAge] will contain the age based on the date of birth entered. If the input box has the YYYY/MM/DD format then the commented section is not required.

 

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

// This section only required to change the dateformat
var dob = [CustomerDOB];
var result = dob.split("/");
dob = result[2] + '-' + result[1] + '-' + result[0];

[CustomerAge] = (getAge(dob));