Convert date to age in ng-repeat

Question

I am trying to convert my date in ng-repeat to age.

But when I use a scope in my controller:

$scope.calculateAge = function(birthday) { 
    var ageDifMs = Date.now() - new Date(birthday);
    var ageDate = new Date(ageDifMs);
    return Math.abs(ageDate.getUTCFullYear() - 1970);
}

Or when I use filter:

myApp.filter('ageFilter', function() {
 function calculateAge(birthday) { // birthday is a date
     var ageDifMs = Date.now() - birthday.getTime();
     var ageDate = new Date(ageDifMs); // miliseconds from epoch
     return Math.abs(ageDate.getUTCFullYear() - 1970);
 }

       return function(birthdate) { 
             return calculateAge(birthdate);
       }; 
      });

With this HTML:

  <div ng-repeat="user in users | limitTo:20" class="col-50">
    <div class="memba-picture" style="background:url({{ user.picture }}">
      <div class="memba-gradient"><i class="fa fa-check memba-wanted"></i></div>
        <span class="memba-title">{{user.first_name}}</span>
        <p class="memba-age">{{user.more.birthday | ageFilter}} Ans</p> <!-- Or calculateAge -->
    </div>
  </div>

It doesn't work. But when I get date with scope in my controller, it works. I think it's maybe because when I get date, I convert it with good format:

  userRef.child(birthday).once('value', function(snap) {

    $scope.birthday = new Date(snap.val());

  })

How can I get the age correctly?

Thanks.

Answer 1

Thanks to the solution given by PixelBits at this question, I was able to solve my problem. Here is how I proceeded:

Controller:

$scope.calculateAge = function calculateAge(birthday) { // birthday is a date
    var ageDifMs = Date.now() - birthday.getTime();
    var ageDate = new Date(ageDifMs); // miliseconds from epoch
    return Math.abs(ageDate.getUTCFullYear() - 1970);
}

HTML

{{ calculateAge(user.more.birthday) }}

Thank you all !