validate D.O.B.

dobVal.js

// Validate date of birth
 
$("#frm1").submit(function(){
    var d = $("#day").val();
    var mth = $("#month").val();
    var yr = $("#year").val();
    
    // arbitrary number for example
    var age = 18;
    
    var dt = new Date();
    dt.setFullYear(yr, mth-1, d);
 
    var curdt = new Date();
    curdt.setFullYear(curdt.getFullYear() - age);
    if ((curdt - dt) < 0){
        alert("!!!");
        return false;
    }
    return true;
});