title: Google charts hAxis grid lines at months
body: <p>I've got problem with LineChart - I've got my chart date values from mid april to mid june and I want to make hAxis grid lines showing only borders between months from my data. Manually I've made it this way:</p>
  
  <pre><code>hAxis: {
        textStyle: { fontSize: 10, color: '#999999' },
        gridlines:{ color: '#eee' },
        textPosition: 'in',
        baselineColor: '#eee',
        format: 'M',
        ticks: [
          new Date(2016, 4, 1),
          new Date(2016, 5, 1),
          new Date(2016, 6, 1)
        ]
      }
  </code></pre>
  
  <p>But I want it to be made automatically fitting my data. Anyone can help?</p>