Javascript - Format an integer date (FormatDate)

Convert an integer string (e.g. "/Date(1659369600000)/") to Date

let dateTxt = "/Date(1659369600000)/";

let dateNew =  new Date(parseInt(dateTxt.substr(6)));

document.getElementById("demo").innerHTML = date.toDateString() + "  " + date.toLocaleTimeString();

result = Thu Sep 22 2022 11:16:07 AM

or

let dateTxt = "/Date(1659369600000)/";

let dateStr = dateStr.match(/\d+/); //"1659369600000"

let dateInt = parseInt(dateStr); //1659369600000

let dateObj = new Date(dateInt); //convert integer to a date

let dateFmt = dateObj.toShortFormat(); //"2-Aug-2022"