[Chartjs]-Chart.js parser returns the wrong date (suddenly back in 1990)

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You simply need to put quotes around the x values, and also set the x-axis type to ‘time’, that should resolve the issue!

I updated the display formats to show nicer x-axis labels

displayFormats: { 'day': 'DD-MMM'}

I’ve also separated the input data into its own variable, if this looks like what is coming from your backend all should be good:

const inputData = [
    {x:'2020-01-23',y:25.55,date:[2020,1,23]},
    {x:'2020-01-24',y:21.53,date:[2020,1,24]},
    {x:'2020-01-25',y:21.11,date:[2020,1,25]}
];

var config = {
        type:    'scatter',
        data:    {
            datasets: [
                {
                    label: "US Dates",
                    data: inputData,
                    fill: false,
                    borderColor: 'red'
                }
            ]
        },
        options: {
            responsive: true,
            title:      {
                display: true,
                text:    "Chart.js Time Scale"
            },
            scales:     {
                xAxes: [{
                     type: 'time',
                     time: {
                        parser: 'YYYY-MM-DD',
                        tooltipFormat: 'll',
                        unit: 'day',
                        unitStepSize: 1,
                        displayFormats: {
                            'day': 'DD-MMM',
                        }
                       },
                    scaleLabel: {
                        display:     true,
                        labelString: 'Date'
                    }
                }],
                yAxes: [{
                    scaleLabel: {
                        display:     true,
                        labelString: 'value'
                    }
                }]
            }
        }
    };

    window.onload = function () {
        var ctx       = document.getElementById("canvas").getContext("2d");
        window.myLine = new Chart(ctx, config);
    };
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