score:1

Accepted answer

I see that date variable in your code is a string:

            // all data lines start with a double quote
            line = line.split(',');
            date = line[1] + " " + line[2];

            (...)

                RTC.push([
                    date,
                    parseInt(line[3], 10)
                ]);

If you choose to construct the point's options as an array of two values and the first value is a string then it's treated as its name property (not x).

Explanation: https://www.highcharts.com/docs/chart-concepts/series

In that case Highcharts assigns subsequent integers as x values for all points (that's why there're values like 00:00:00.000 (1 Jan 1970), 00:00:00.001 etc.).

You need to parse your date to timestamp. You can use Date.UTC() (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/UTC) or some other function for this.

score:0

I've managed to get it working with Date.UTC using the following code: 

var yyyymmdd = line[2].split("-"); //Split the date: 2017 12 16
var hhmmss = line[3].split(":"); //Split the time: 16 11 14
var date = Date.UTC(yyyymmdd[0], yyyymmdd[1] - 1, yyyymmdd[2], hhmmss[0], hhmmss[1], hhmmss[2]); //Stitch 'em together using Date.UTC

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