I've been looking for some weeks and I have not found any optimal solution for this problem:
The date in the red box on the picture should change according to the country location of the user.
Example: For the US -> Thursday, Oct 6 2016, 11:27:59 PM
In my code is fixed the xDateFormat to: "%A, %e.%b %Y, %H:%M:%S"
but it should change dynamically as I said before.
I have not found any built-in function in the highcharts documentation http://api.highcharts.com/highstock/tooltip.xDateFormat.
Another solution would be to create my own table with the country formats according to: https://stackoverflow.com/a/9893752. For this I should detect first the IP of the user and the localize the country.
Does anyone has a better idea?