Hello. I cannot find any information about the little popup date tooltip thing that you see on the highcharts stock chart when you mouse over the chart. Screenshot attached. That label near the x axis, how do I change the format?
Okay but how do I change JUST the tool tip header? I don't want to mess with the label formatting, yet I don't see any way to just customize the header. I want to change how it shows the date. I need to put some logic into it so I need a custom function.
If it's something simple, you can use headerFormat. If you need to use a custom function with additional logic, you could just extend the tooltip.defaultFormatter.