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How to convert a string in yyyy-mm-dd format to a Javascript Date Object without considering the date as UTC

I really just have a simple question. I want to convert a string in yyyy-mm-dd to a date object in javascript. This seems simple enough. You can just do the following.
var date = new Date('2020-04-08');
But in this case, javascript considers the date '2020-04-08' as UTC midnight. So the actual date that is returned to me is the following.
Tue Apr 07 2020 17:00:00 GMT-0700 (Pacific Daylight Time)
I know I can create a date in the following format
var date = new Date(2020, 3, 8);
Wed Apr 08 2020 00:00:00 GMT-0700 (Pacific Daylight Time)
But it looks like too much hassle to extract the year, month and date from the already nicely formatted date string. Isn't there a simple way to convert yyyy-mm-dd string to a date object without it being treated as UTC date?
So in the simplest terms, my question is how do I tell the date constructor that the date I am passing is not a UTC date but a local date.

Simply append 'T00:00:00' to your date string.
const dateString = '2020-04-08'
const timeString = 'T00:00:00'
const date = new Date(dateString + timeString);
console.info(date.toString())
From the documentation
Support for ISO 8601 formats differs in that date-only strings (e.g. "1970-01-01") are treated as UTC, not local.

How to convert JSON time stamp in javascript to date and time?

I am getting Time stamp as "2020-03-02T05:50:31.000Z"
How to convert this to Normal Readable Format with Date and Time Zone

const parsedDate = new Date("2020-03-02T05:50:31.000Z");
console.log(parsedDate.toGMTString())
//"Mon, 02 Mar 2020 05:50:31 GMT"
console.log(parsedDate.toLocaleString())
//"3/2/2020, 11:20:31 AM"
console.log(parsedDate.toDateString(), parsedDate.toTimeString())
//Mon Mar 02 2020 11:20:31 GMT+0530 (India Standard Time)

In java-script above date format can be parsed by using Date.
Eg:
var date = new Date('2020-03-02T05:50:31.000Z');

I don't know what you mean readable format but you can use following methods:
new Date('2020-03-02T05:50:31.000Z').toLocaleString();
// outputs date according to user locale settings
Or you can use getYear, getMonth, getDay methods to get them and format date as you want

You can use moment.js for date time format and conversion.
Pass your date timestamp as below:
moment.parseZone("2020-03-02T05:50:31.000Z").format("DD-MM-YYYY hh:mm:ss z Z")
Modify format as you need ref mentioned here
Use in your code as mentioned here

needs understanding of this format of date and time

I just came across this format of start and end in the codebase which is probably the starting and ending date and time.However, I could not figure out this.
I know how to generate date and time in javascript but I need to generate it in this format to be able to fetch data from API.
Here is the format.
start : '2018-06-20T11:44:21.938Z',
end : '2018-07-20T11:44:21.938Z',
At the same time, I would like to know how to get date and time with exact this format?

It is ISO format of the date. You can use toISOString() method to achieve it:
// current date
var date = new Date();
console.log(date);
console.log(date.toISOString());

let date = new Date( Date.parse('2018-06-20T11:44:21.938Z'));
To retrieve date & time separately.
date.toLocaleDateString();
date.toLocaleTimeString()'
To convert any date object to your desired format (ISO Dates):
var date = new Date();
date.toISOString();

var date = new Date(Date.parse('2018-06-20T11:44:21.938Z'));
It's ISO 8601 format.
Check this:
https://en.wikipedia.org/wiki/ISO_8601

Have a look at toISOString() in MDN
var event = new Date('05 October 2011 14:48 UTC');
console.log(event.toString());
// expected output: Wed Oct 05 2011 16:48:00 GMT+0200 (CEST)
// (note: your timezone may vary)
console.log(event.toISOString());
// expected output: 2011-10-05T14:48:00.000Z

That is the ISO date format.
similar to this:
How do I output an ISO 8601 formatted string in JavaScript?
Here is code to produce it.
function myFunction() {
var d = new Date();
var n = d.toISOString();
document.getElementById("demo").innerHTML = n;
}
<button onclick="myFunction()">convert to ISO date format</button>
<p id="demo"></p>

It is an ISO date. Check this link for some info:
https://www.w3schools.com/js/js_date_formats.asp
var istDate = new Date(); // will return: Wed Sep 05 2018 17:50:39 GMT+0530 (India Standard Time)
var isoDate = istDate.toISOString(); // will return in ISO format i.e. "2018-09-05T12:20:39.732Z"
var dateString = istDate.toDateString(); // will return in format: "Wed Sep 05 2018"
Browser console will provide suggestions for various methods of Date Object for extracting day, month, year, etc from the new Date()

Convert UNIX to readable date in javascript

I am trying to figure out, how i can convert a unix timestamp to a readable date using javascript.
For an example, i want to convert this unix: 1422360000, to a date format like this (or something simular):
Tue, 27 Jan 2015 12:00:00 GMT
Solution:
var timestamp = 1422360000;
var date = new Date(timestamp * 1000);

This is the exact solution to the question.
var timestamp = 1422360000;
var date = new Date(timestamp * 1000);
Result: Tue Jan 27 2015 13:00:00 GMT+0100

Simply use Date(value)
value: Integer value representing the number of milliseconds since 1 January 1970 00:00:00 UTC (Unix Epoch).
Code
new Date(1422360000)

try this:
new Date(1422360000).toString()
That will make your date look like the string you want.

Converting Javascript Date

I have a date String in this format: Tue Sep 02 00:00:00 GMT+200 2014, I'd like to have only in Javascript this ISO Format: 2014-09-02T00:00:00.000Z.
So I have wrote this code:
var date = new Date("Tue Sep 02 00:00:00 GMT+200 2014");
date.toJSON();
but it returns: "2014-09-01T22:00:00.000Z".
How can I have the right date in ISO format? Thank you.

If you want to use the JavaScript native Date Object, you may want to look at its documentation first, especially the toISOString() method.
var date = new Date("Tue Sep 02 00:00:00 GMT+200 2014");
var n = date.toISOString();
this returns:
n: '2014-09-01T22:00:00.000Z'
which is the right ISO format. Your initial time is GMT+2 so, in ISO time, it corresponds to the same date/time but two hours before. As it is the 2nd of Sept, 00:00:00, 2 hours before lead to the day before, the 1st of Sept, at 22:00:00. You can't have the 2014-09-02T00:00:00.000Z you want in your question because it is not corresponding to an ISO date.
You can read more about ISO 8601 on Wikipedia.

There is a method for that.
date.toISOString()