JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="date" name="date" value="CurrentTime">
<input type="text" id="time" name="time" value="CurrentDate">

JavaScript

var d = new Date();

// Get today's date
var day = d.getDate();
var month = d.getMonth() + 1; // The months are 0-based
var year = d.getFullYear();

// Prepend the day and month with 0
// Comment this out/remove it, to use the day and month as-is
if (day < 10) {
  day = "0" + day;
}
if (month < 10) {
  month = "0" + month;
}
// Set the date field to the current date
document.getElementById("date").value = day + "/" + month + "/" + year;

// Get the current time
var hours = d.getHours();
var mins = d.getMinutes();
var seconds = d.getSeconds();

// Prepend the hours and minss with 0
// Comment this out/remove it to use the hours and mins as-is
if (hours < 10) {
  hours = "0" + hours;
}
if (mins < 10) {
  mins = "0" + mins;
}

// Set the time field to the current time
document.getElementById("time").value = hours + ":" + mins + ":" + seconds;