New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  date: null
});

helpers.format-date.js

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

export function formatDate(params) {
  console.log('here', params);
  
  console.log('moment', moment(params[0]).format(params[1]))
  return moment(params[0]).format(params[1]);
}

export default Ember.Helper.helper(formatDate);

helpers.format.js

import Ember from 'ember';

export function format(params) {
  console.log(params);
  return params[0].toUpperCase();
}

export default Ember.Helper.helper(format);

templates.application.hbs

<h1>Example of Passing a moment format</h1>
{{outlet}}

{{pikaday-input
	value=date
  format="MM/DD/YYYY"
  onSelection=(action (pipe (mut date value=target.value) (format-date  "YYYY-MM-DD") this))
}}

<br>
<br> 
 
Date: {{mut date}}

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-pikaday": "2.2.2",
    "ember-moment": "7.3.0",
    "ember-composable-helpers": "2.0.0"
  }
}