     $scope.sleepChartConfig =
       data:
         x: 'dateTime'
+        xFormat: '%Y-%m-%d',
         json: []
         keys:
           x: 'dateTime'

        x:
          type: 'timeseries'
          tick:
            format: '%Y-%m-%d'
      grid:
        y:
          lines: [{value: 10000, text: 'Daily Goal'}]

        x:
          type: 'timeseries'
          tick:
            format: '%m/%d'
      grid:
        y:
          lines: [{value: 420, text: 'Daily Goal'}]
