JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [['Date.UTC(2013, 9, 17)',1],['Date.UTC(2013, 9, 18)',5],['Date.UTC(2013, 9, 19)',2],['Date.UTC(2013, 9, 20)',4]];

console.log(data);

for(var i = 0; i < data.length; i++) {
    data[i] = [eval(data[i][0]), data[i][1]];
}
console.log(data);