How to change X-Axis Interval on Chart.js

I have a line graph on Chart.js and am trying to edit the intervals on the x-axis and the y-axis.

My y-axis intervals are functioning as expected, but my x-axis intervals are not.

I tried the following code

let myChart = new Chart(inputChart, {
    type: 'line',
    data: {
          labels: [1,2,....,360] // list of values from python script
          data: [360 random numbers here] 
    }
    options: {
        scales: {
            yAxes: [{
                id:'main-axis',
                ticks: {
                     stepSize: 40 // this worked as expected
                        }
                   }],
            xAxes: [{
                id: 'main-x-axis',
                ticks: {
                    stepSize: 30 // this did not work as expected
                }
            }]
        }
    }
})

With 360 datapoints, I just want to basically see 12 intervals (in increments of 30), but I am seeing 90 intervals in increments of 4 instead. Am I just using the wrong property for stepSize? If so what is the correct property?

It can be done using the maxTicksLimit option of xAxes, see this working fiddle -> http://jsfiddle.net/Lzo5g01n/3/

xAxes: [{
    type: 'time',
    ticks: {
        autoSkip: true,
        maxTicksLimit: 20
    }
}]