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Say you have dates stored in UTC format but the users of your app are in different time zones.
You probably want to display the date formatted/converted for getTimezoneOffset()
method
off the UTC date.
let utcDate = new Date("2011-06-29 16:00:00.000");
let localDate = new Date(utcDate.getTime() - utcDate.getTimezoneOffset() * 60 * 1000);
document.getElementById("demo1").innerHTML = utcDate;
document.getElementById("demo2").innerHTML = localDate;