[Solved]-Chart.js creating a line graph using dates-Chart.js

My suggestion would be to add the moment.js library to your project and format your dates using moment. Also I'm not sure about using the "t" and "y" here. I'd add the time as labels and matched that with the x data:

var data = {
  labels: [moment().format("YYYY-MM-DD"), moment().format("YYYY-MM-DD"), moment().format("YYYY-MM-DD")],
  datasets: [
    {
        data: [12,21,32],
    }
  ]
};

var myBarChart = Chart.Line(canvas,{
data:data,
});

There is a fiddle example here.

when using time, you have to use UTC time, as your local time is added(australia +10 hours / 36000 secs) so every country has a different time zone. the key is to use moment.utc in any conversion of time 0 seconds = moment.utc('1970-01-01 00:00:00')

use moment.utc('1970-01-01').add(3600, 'seconds')to add a value and then from y-axis values or tool tip items, you have to reference

callback: value => {
    date = moment.utc(value);
    if(date.diff(moment.utc('1970-01-01 23:59:59'), 'minutes') === 0) 
    {
        return null;
    };
    date.format('HH:mm:ss');
}

label: (item, data) => data.datasets[item.datasetIndex].label +" "+ 
moment.utc(data.datasets[item.datasetIndex].data[item.index]).format("HH:mm:ss")

https://lopeys.com/ironman/IMAUS_Charts_StackedTimes.htm

Building on what @RamizWachtler has answered, you can add to the options section of the chart to scale the times out properly. I'll note that this doesn't seem to work with Charts.js 2.3. Added a working snippet that uses the latest Charts.js version as of April 2019.

Additionally I've changed the time formatting to be ISO8601 compliant.

var chart = new Chart(ctx, {
    type: 'line',
    data: data,
    options: {
        scales: {
            xAxes: [{
                type: 'time',
                distribution: 'linear'
            }]
        }
    }
});

Source - https://www.chartjs.org/docs/latest/axes/cartesian/time.html

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

var myChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ["2015-03-15T13:03:00Z", "2015-03-25T13:02:00Z", "2015-04-25T14:12:00Z"],
    datasets: [{
      label: 'Demo',
      data: [{
          t: "2015-03-15T13:03:00Z",
          y: 12
        },
        {
          t: "2015-03-25T13:02:00Z",
          y: 21
        },
        {
          t: "2015-04-25T14:12:00Z",
          y: 32
        }
      ],
      backgroundColor: [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
      ],
      borderColor: [
        'rgba(255,99,132,1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
      ],
      borderWidth: 1
    }]
  },
  options: {
    scales: {
      xAxes: [{
        type: 'time',
        distribution: 'linear'
      }]
    }
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0-rc.1/Chart.bundle.js"></script>
<div class="container">
  <canvas id="examChart"></canvas>
</div>