Hi.

By default, JavaScript will use the browser’s time zone.
How many hours is it deviated from the actual time?

As for the time in the axis, we’re using the default timestamp: https://api.highcharts.com/highstock/xAxis.dateTimeLabelFormats

Can you try using:

dateTimeLabelFormats: { minute: '%H:%M' }

instead of the following in the JavaScript file:

dateTimeLabelFormats: { second: '%H:%M:%S' }

And see if it shows a more suitable time format?

Regards,

Sara

Hello
I made this change but the result is the same. The X-axis time is still an hour behind. Also the timestamp goes back one hour. It is the same on the PC as on the smartphone.
My time zone setting is:
(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna

Hi.
I’m not sure why, but you probably need to adjust the time manually in the JavaScript code.
Here’s the code with UTC+01:00: https://gist.github.com/sarasantos/2b735d24b901e5ce36d0008dbe3c5505
Let me know if this code works for you.
 
Basically, create a new prototype addHours() to add how many hours you want to the UTC:

Date.prototype.addHours= function(h){
  this.setHours(this.getHours()+h);
  return this;
}

Then, simply use it on the Date() objects like this to add an hour:

var x = new Date().addHours(1).getTime();

Regards,
Sara

Hello
Thanks for the tip, it works. My son has suggested another solution to me, which also works, see link:
https://api.highcharts.com/highcharts/time.getTimezoneOffset
https://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/highcharts/time/gettimezoneoffset/
Greetings
Helmut

Hi.
Thanks for sharing that.
That’s a better solution as it uses the highcharts JS API.
Regards,
Sara

I’ll close this question.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara