Editing the chart ui tooltip

Hello,
I've been playing with the chart ui lately. I've modified the tooltip using a change node for a better view,
But after deployed, I noticed that the time has been converted from the LocaleTimeString format to timestamps.
image
How do I have this displayed in the LocaleTimeString format.
Without the modification, the time display is user friendly..
image
but the data are not quit visible....

When you need help it is a good idea to provide enough information for people to help you. You should provide

  1. the version of Node-Red and node.js you are running (you can get this from the NR startup log)
  2. the version of the dashboard you are running (also in the startup log)
  3. the device you are running NR on (Pi, Windows, Mac etc)
  4. are you using Home Assistant or Docker
  5. a small flow demonstrating the issue (capture the data you are sending to the chart by sending it to a debug node, then put that in an inject node and send it to your chart to make sure it replicates your issue. Then you can export that flow and attach it to a reply.)

In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)

``` 
   code goes here 
```

See this post for more details - How to share code or flow json