Custom field in Employee Master to calculate employee age

[NCP]

You can develop using both side, server and client.

client script:

frappe.ui.form.on('Employee', {
    date_of_birth: function(frm) {
        var dob = frm.doc.date_of_birth;
        if (dob) {
            var today = new Date();
            var birthDate = new Date(dob);
            var age = today.getFullYear() - birthDate.getFullYear();
            var m = today.getMonth() - birthDate.getMonth();
            if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
                age--;
            }
            frm.set_value('age', age);
        }
    }
});

Server side:

import datetime

def calculate_age(doc, method):
    if doc.date_of_birth:
        today = datetime.date.today()
        dob = doc.date_of_birth
        age = today.year - dob.year - ((today.month, today.day) < (dob.month, dob.day))
        doc.age = age