How to call a function in javascript on a key

`import Ember from 'ember'`

 DatePickerComponent = Ember.Component.extend
 dateFormat: 'dd.mm.yy'
 today: currentDate
 currentDate: ->
   today =  Date()
   today

export default DatePickerComponent

Reference Error, currentDate not defined. Also get it when today: currentDate

How do I call this ?

I my handlebar file I want to access todays date.