[Chartjs]-Chartjs 2.7.3: Set Y data at the correct X position axis

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Since you specified the x/y coordinates of your data set, you have to set your xAxes scale type as time in your chart options. 

var options = {
  scales: {
    xAxes: [
      {
        type: "time"
      }
    ]
  }
};

See official docs for all possible configurations or check the options used in the working example below.

Important: You have to change the date format in your data set to something like 'YYYY-MM-DD' otherwise moment would throw this warning.

Deprecation warning: value provided is not in a recognized RFC2822 or
ISO format. moment construction falls back to js Date(), which is not
reliable across all browsers and versions.

var data = {
  labels: [
    "2018-10-29",
    "2018-10-30",
    "2018-11-02",
    "2018-11-14",
    "2018-11-15",
    "2018-11-19",
    "2018-11-20",
    "2018-11-28"
  ],
  datasets: [{
      pointRadius: 0,
      label: "Positive",
      lineTension: 0,
      data: [{
        x: "2018-11-15",
        y: 18636
      }],
      borderWidth: 1,
      backgroundColor: "rgba(0, 255, 0, 0.5)"
    },
    {
      pointRadius: 0,
      label: "Negative",
      lineTension: 0,
      data: [{
          x: "2018-10-29",
          y: -20480
        },
        {
          x: "2018-10-30",
          y: -284
        },
        {
          x: "2018-11-02",
          y: -1625
        },
        {
          x: "2018-11-14",
          y: -6622
        },
        {
          x: "2018-11-15",
          y: -12991
        },
        {
          x: "2018-11-19",
          y: -1645
        },
        {
          x: "2018-11-20",
          y: -1230
        },
        {
          x: "2018-11-28",
          y: -39612
        }
      ],
      borderWidth: 1,
      backgroundColor: "rgba(255, 0, 0, 0.5)"
    }
  ]
};
var options = {
  scales: {
    xAxes: [{
      type: "time",
      distribution: 'series',
      time: {
        displayFormats: {
          day: 'D MMM, YY'
        }
      },
      ticks: {
        source: "labels"
      },
      gridLines: {
        display: false
      }
    }]
  }
};

var ctx = document.getElementById("myChart").getContext("2d");

var myBarChart = new Chart(ctx, {
  type: "bar",
  data: data,
  options: options
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<canvas id="myChart" width="300" height="100"></canvas>

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