JSFiddle - React, Tailwind, and code Playground

HTML

<input class='test' type='date' value='2020-06-04' />

JavaScript

const date = "2020-06-04";
const input = document.querySelector('.test');

input.onkeydown = function(e) {
	return false;
}

input.onchange = function(e) {
	this.value = date;
}