gistfile1.js

{{view App.ToolbarField valueBinding="Sheduler.toolbarController.selectedDate"}}

DATE =
  from: (controllerDate) ->
    new Date(controllerDate)

  to: (viewDate) ->
    viewDate.toString()

App.ToolbarField = SC.TextField.extend
  valueBinding: SC.Binding.from('Scheduler.toolbarController.selectedDate').transform(DATE)

Scheduler.toolbarController = SC.Object.create
  selectedDate: <something>