How to apply date constructor to specific attribute of JSON object

I have an x, y JSON object like this

var myJSON = [{x: "2021-06-29T02:00:00.000Z", y: 45.87},
    {x: "2021-06-29T03:00:00.000Z", y: 45.97},
    {x: "2021-06-29T04:00:00.000Z", y: 47.84},
    {x: "2021-06-29T05:00:00.000Z", y: 48.64}]

I would like to apply the date constructor to X for each entry in the array. I have also converted an array format if that is better.

var myArr =[["2021-06-29T02:00:00.000Z", 45.87],
  ["2021-06-29T03:00:00.000Z", 45.97],
  ["2021-06-29T04:00:00.000Z", 47.84],
  ["2021-06-29T05:00:00.000Z", 48.64]]

I currently get from the JSON to the array like so:

var myArr= myJSON.map(d => Array.from(Object.values(d)));

Answer

Simply apply new Date(x) when converting

var myJSON = [
  { x: "2021-06-29T02:00:00.000Z", y: 45.87 },
  { x: "2021-06-29T03:00:00.000Z", y: 45.97 },
  { x: "2021-06-29T04:00:00.000Z", y: 47.84 },
  { x: "2021-06-29T05:00:00.000Z", y: 48.64 },
];

const result = myJSON.map(({ x, y }) => [new Date(x), y]);

console.log(result);

Note: console.log on a snippet shows the date as a string, but confirm in your browser console that it is a date