If you want to put date information as string like "2020-07-30" to date in javascript, bingo! - it works correctly.
ISO 8601 is the international standard for the representation of dates and times. The ISO 8601 syntax (YYYY-MM-DD) is also the preferred JavaScript date format:
var d = new Date("2020-07-30") // note you should type Date not date !!!
If you want to get its element value like FullYear, Month, Date, Hours, and etc. You can simply get it like below.
var d = new Date();
document.getElementById("demo").innerHTML += d.getFullYear(); // Get the year as a four digit number (yyyy)
document.getElementById("demo").innerHTML += d.getMonth(); // Get the month as a number (0-11)
document.getElementById("demo").innerHTML += d.getDate(); // Get the day as a number (1-31)
document.getElementById("demo").innerHTML += d.getHours(); // Get the hour (0-23)
document.getElementById("demo").innerHTML += d.getMinutes(); // Get the minute (0-59)
document.getElementById("demo").innerHTML += d.getSeconds(); // Get the second (0-59)
document.getElementById("demo").innerHTML += d.getMilliseconds(); // Get the millisecond (0-999)
document.getElementById("demo").innerHTML += d.getTime(); // Get the time (milliseconds since January 1, 1970)
document.getElementById("demo").innerHTML += d.getDay(); // Get the weekday as a number (0-6)
document.getElementById("demo").innerHTML += Date.now(); // Get the time. ECMAScript 5.
If you want to convert it to string in Javascript
var d = new Date(); var n = d.toString();