non-equidist bars

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.js"></script>
<script src="https://raw.githubusercontent.com/chartjs/chartjs.github.io/master/dist/master/Chart.js"></script>

<canvas id="myChart2"></canvas>

JavaScript

var ctx2 = document.getElementById('myChart2').getContext('2d');
var chart2 = new Chart(ctx2, {
  type: 'bar',
  data: {
    datasets: [{
      data: [
        {x: moment('2017-07-10').valueOf(), y: 1},
        {x: moment('2017-07-11').valueOf(), y: 2},
        {x: moment('2017-07-13').valueOf(), y: 4}
      ]
    }]
  },
  options: {
    title: {
      display: true,
      text: 'Point objects with time in Number format'
    },
    scales: {
      xAxes: [{
        type: 'time',
        time: {
          unit: 'day'
        },
        offset: true
      }],
      yAxes: [{
        ticks: {
          beginAtZero: true
        }
      }]
    }
  }
});