Split Date w/ Two-Way Computed

components.x-year-month.js

import Ember from 'ember';
import moment from 'moment';


export default Ember.Component.extend({
  value: Ember.computed('month', 'year', {
    get() {
      let month = this.get('month') - 1;
      let year = this.get('year');
      return moment().year(year).month(month);
    },
    set(_, value) {
      let month = value.month() + 1;
      let year = value.year();
      
      this.set('month', month);
      this.set('year', year);
      
      return moment();
    }
  })
});

controllers.application.js

import Ember from 'ember';
import moment from 'moment';

export default Ember.Controller.extend({
  init() {
    this._super(...arguments);
    this.set('date', moment('1970-01-01'));
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{x-year-month value=date}}

<hr>

Moment Value: {{moment-format date 'MM-YYYY'}}

templates.components.x-year-month.hbs

Month: {{input value=month}}
<br>
Year: {{input value=year}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1",
    "ember-moment": "7.0.1",
    "ember-input-range": "1.0.0"
  }
}