JSFiddle - React, Tailwind, and code Playground

HTML

<label for="start">Start date:</label>

<input type="date" id="start" name="trip-start"
       value="2018-07-22"
       min="2018-01-01" max="2018-12-31">

JavaScript

let date = document.getElementById("start");
console.log(date.value);
console.log(typeof date.value);
console.log(new Date(date.value));