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How to convert Date format like this Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time) to 2020-04-20T00:00:00.000Z in Javascript?

I have a Date format like this "Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time)"
I want to convert that above format to this format 2020-04-20T00:00:00.000Z
Actually I tried this JSON.stringify(new Date("Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time)")) while using this am getting the output one day before 2020-04-19T18:30:00.000Z
so please anyone help me to convert this date format "Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time)" like this 2020-04-20T00:00:00.000Z
Thanks in Advance.

Your date seems to be a standard string representation of new Date(), you can get the desired format by using new Date().toISOString()
console.log(new Date().toString())
console.log(new Date().toISOString())
// To create it from string
const dateStr = "Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time)"
console.log(new Date(dateStr).toISOString())

Anurag Srivastava's answer shows how you should parse the string and format it in the required format (given that the string is in one of the two formats supported by ECMA-262 and considering Why does Date.parse give incorrect results?).
Note that "Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time)" is the same instant in time as "2020-04-19T18:30:00.000Z". The first string is offset from UTC by 5 hr 30 min, so the equivalent UTC time is 5 hr 30 min earlier, which means the date is the previous day.
You haven't given a reason why you want to treat it as UTC and not consider the offset, so I don't think you should.
However, if you do have a good reason to parse it as UTC and ignore the supplied offset, then you can either:
Modify the input string to set the offset as +0 and parse it using the built–in parser
Parse the string yourself and treat it as UTC
let s = "Fri Apr 20 2020 00:00:00 GMT+0530 (India Standard Time)";
// #1 Modify the input string, setting the offset to +0
let d = new Date(s.replace(/GMT.*$/,'GMT+0000')).toISOString();
console.log(d.toISOString());
// #2 Bespoke parser
function parseAsUTC(s) {
let months = ['jan','feb','mar','apr','may','jun',
'jul','aug','sep','oct','nov','dec'];
let b = s.split(/\W/);
return new Date(Date.UTC(b[3], months.indexOf(b[1].toLowerCase()),
b[2], b[4], b[5], b[6]));
}
console.log(parseAsUTC(s).toISOString());

How to convert PST timezone date to Local TimeZone in Javascript?

I'm getting the date in PST TimeZone and need to convert it to local TimeZone. I'm developing a product in CRM so TimeZone can be changed user to user.
I tried to use moment JS but for that, we need to specify the country/ city name and all I'm getting is TimeZoneOffset. I have a code for UTC to local time zone if it gets converted to UTC also then my work will be done.
Fri Jan 17 2020 22:57:49 GMT-0800 (Pacific Standard Time)
Need the answer in TS if possible or JS will be ok. Thank you.

To Convert other time zones to local time zone. You can use the following in javascript.
var date = new Date(other time zone value);
date.toString();
For example
var date = new Date('Fri Jan 17 2020 22:57:49 GMT-0800 (Pacific Standard Time)');
date.toString();
result will be "Sat Jan 18 2020 12:27:49 GMT+0530 (India Standard Time)"

How to convert time to specific string?

I'm working with a date that looks like this:
Mon Feb 04 2019 15:57:02 GMT-0700 (Mountain Standard Time)
and I'm trying to convert it to this:
2019-02-04T15:57:02.000Z
but for some reason my code always adds 7 hours and ends up being like this:
"2019-02-05T22:57:02.000Z"
Can anyone tell me what I'm doing wrong? Thanks a lot in advance!
Here's my code:
new Date(myTime as string).toISOString();

I'd use Moment.js, which is a decent date parsing and formatting library. To get what you're looking for, you'd use a statement like:
console.log(moment
.parseZone(
"Mon Feb 04 2019 15:57:02 GMT-0700 (Mountain Standard Time)",
"ddd MMM DD YYYY HH:mm:ss 'GMT'ZZ") // the format of the string presented
.local()
.format('YYYY-MM-DDTHH:mm:ss')); // the format of the output
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
I've broken the single line out into parts so it's a bit easier to read. A few notes:
parseZone allows you to parse the "-0700" from the string.
local converts the date from the parsed time zone to the current time zone
format formats the date.
The format topic has a list of the formatting tokens used.
The Parse > String + Format topic lists the parsing tokens (which are the same as the formatting tokens for the most part).
Note that the output does not have a "Z" at the end; this is important because without the "Z", it is a local date. With the "Z" you are are actually specifying a date and time that is 7 hours earlier than the one you've been given.

I'm not sure how to get this as a one-liner, but this is one way:
var time = new Date('Mon Feb 04 2019 15:57:02 GMT-0700 (Mountain Standard Time)')
new Date(time.setHours(time.getHours() + 7)).toISOString()
"2019-02-05T12:57:02.000Z"

Your code is not adding hours to the input date. What is happening is that your date string is using a particular timezone GMT-0700 (Mountain Standard Time) and the time zone used in new Date().toISOString() is UTC GMT+0000 (UTC). So when in the Mountain Standard Time timezone is Mon Feb 04 2019 15:57:02, in the UTC timezone is actually 2019-02-05T22:57:02.000Z. There are your seven hours from GMT-0700 to GMT+0000.
EDITED
If you don't really care about time zones and want to obtain 2019-02-04T15:57:02.000Z from Mon Feb 04 2019 15:57:02 GMT-0700 (Mountain Standard Time) you could just strip everything after GMT to let new Date() think it is an UTC date.
var timeString = 'Mon Feb 04 2019 15:57:02 GMT-0700 (Mountain Standard Time)';
new Date(timeString.substr(0, timeString.indexOf('GMT') + 3));
2019-02-04T15:57:02.000Z

Converting Timestamp to Date gives different timezones in the result?

I have a database where I have put down timestamps that are converted to UTC.
Now, when I am on PST, I convert 2 timestamps in Chrome, which get back to the following dates:
new Date(1446274800000)
Sat Oct 31 2015 00:00:00 GMT-0700 (PDT)
new Date(1448265600000)
Mon Nov 23 2015 00:00:00 GMT-0800 (PST)
They differ in timezone! How is this possible? I always just want to get back the PST time (or, preferably, the UTC time they were stored in).

Looks like it's daylight savings time.

How to get date object from date string format

I'm trying to convert a date string to date format, something like this:
var date = "07/11/2015"; //format is mm/dd/yyyy
Now I want it to be in this format:
date = Tue Sep 01 2015 00:00:00 GMT+0530 (India Standard Time)
Can anyone suggest a way to achieve it. Thanks in advance!

var date = "07/11/2015";
alert(new Date(date)); //Sat Jul 11 2015 00:00:00 GMT+0530 (India Standard Time)