JAVASCRIPT

set date input html using js

document.getElementById("datePicker").valueAsDate = new Date()

set date to input date js

var date =  new Date();
var currentDate = date.toISOString().substring(0,10);

how assign custom date to input type date in javascript

<input id="dob" type="date" value="<?php echo date("Y-m-d"); ?>">
document.getElementById("dob").value = "2021-02-09";

set date to input date

var now = new Date();
var day = ("0" + now.getDate()).slice(-2);
var month = ("0" + (now.getMonth() + 1)).slice(-2);
var today = now.getFullYear() + "-" + month + "-" + day;

javascript date to html date input

// convert Javascript Date to HTML Input
var now = new Date();
var day = ("0" + now.getDate()).slice(-2);
var month = ("0" + (now.getMonth() + 1)).slice(-2);
var hour = ("0" + (now.getHours())).slice(-2);
var min = ("0" + (now.getMinutes())).slice(-2);
var today = now.getFullYear() + "-" + month + "-" + day + "T" + hour + ":" + min;