intl-formatting.js

const fullFormat = new Intl.DateTimeFormat("en", { dateStyle: "full" });
const now = new Date();

fullFormat.format(now);
// Thursday, October 28, 2021

fullFormat.formatToParts(now)
/*
[
   {
      "type": "weekday",
      "value": "Thursday"
   },
   {
      "type": "literal",
      "value": ", "
   },
   {
      "type": "month",
      "value": "October"
   },
   {
      "type": "literal",
      "value": " "
   },
   {
      "type": "day",
      "value": "28"
   },
   {
      "type": "literal",
      "value": ", "
   },
   {
      "type": "year",
      "value": "2021"
   }
]
*/