JSFiddle - React, Tailwind, and code Playground

JavaScript

var now = new Date();
alert("Local date: "+now)
var isoDate = new Date(now).toISOString();
alert("ISO date with date/time change: "+isoDate);

isoDate = new Date(now.getTime() - now.getTimezoneOffset() * 60000).toISOString();
alert("ISO date with no date/time change: "+isoDate);