offsetGridLines (category scale) v2.6

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.js"></script>
<canvas id="myChart1"></canvas>
<canvas id="myChart2"></canvas>

JavaScript

var ctx1 = document.getElementById('myChart1').getContext('2d');
var chart1 = new Chart(ctx1, {
  type: 'bar',
  data: {
    labels: [0, 1, 2, 3],
    datasets: [{
      data: [2, 4, 6, 8]
    }]
  },
  options: {
    scales: {
      xAxes: [{
        gridLines: {
          offsetGridLines: true
        }
      }]
    }
  }
});
var ctx2 = document.getElementById('myChart2').getContext('2d');
var chart2 = new Chart(ctx2, {
  type: 'bar',
  data: {
    labels: [0, 1, 2, 3],
    datasets: [{
      data: [2, 4, 6, 8]
    }]
  },
  options: {
    scales: {
      xAxes: [{
        gridLines: {
          offsetGridLines: false
        }
      }]
    }
  }
});