Develop Reference

How to change ISO date to Standard JS Date?

I am trying to change an ISO date to a Standard JS Date format. The JS format I am referring to is:
Mon `Jul 20 2020 14:29:52 GMT-0500 (Central Daylight Time)`
What is the best way to go about doing this? Thanks!

const ISO_DATE = '2020-07-14T23:02:27.713Z';
function formatDate(dateStr) {
const date = new Date(dateStr);
return date.toString();
};
console.log(formatDate(ISO_DATE));

One way is:
let isoDate = "2020-07-20T14:29:52Z";
var myDate = new Date(isoDate);
console.log(myDate.toString()); // Mon Jul 20 2020 17:29:52 GMT+0300 ( (your time zone)
console.log("Back to ISO Date: ", myDate .toISOString());
If you want to convert it back to ISO Date use:
console.log(myDate.toISOString());

Format the current date and time using momentjs

I want to convert the current date and time to in the following way using moment.js.
Current date and time using javascript new Date(): Thu Jul 12 2018 09:28:51 GMT+0530 (India Standard Time) and want to convert the above format to below mentioned format.
1. Thu, 12 Jul 2018 09:31:37 GMT
2. 2018-07-12T09:31:38Z

You can learn more about formatting with moment.js here.
Escape words in formatting with escaping-characters "[]".
console.log(moment());
console.log(moment().format('ddd, DD MMM YYYY HH:mm:ss [GMT]'));
console.log(moment().format('YYYY-MM-DD[T]HH:mm:ss[Z]'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>

you can also try like below for
nodejs
var moment = require('moment');
var format1 = moment().utcOffset(330).format('ddd, DD MMM YYYY HH:mm:ss [GMT]')
var format2 = moment().toDate();
console.log(format1);
console.log(format2);
angular
import moment from 'moment';
var format1 = moment().utcOffset(330).format('ddd, DD MMM YYYY HH:mm:ss [GMT]')
var format2 = moment().toDate();
console.log(format1);
console.log(format2);
Install moment like below
npm install --save moment
Html javascript
var format1 = moment().utcOffset(330).format('ddd, DD MMM YYYY HH:mm:ss [GMT]')
var format2 = moment().toDate();
console.log(format1);
console.log(format2);
moment source script
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>

You can use toGMTSting method to convert local time into GMT format. Hope this helps..
console.log(new Date().toGMTString());
console.log(new Date("Fri Jan 20 2012 11:51:36 GMT-0530").toGMTString());

You can try these also:
var moment = require('moment');
let startDate= new moment('11/22/1990','MM/DD/YYYY').format("YYYY/MM/DD");
You can also understand these:
let otherDate= 1399919400000;
var neweDate = moment(otherDate).format('DD/MM/YYYY');
//My neweDate output is "13/05/2014";
moment.locale('cs');
console.log(moment.locale()); // en
moment("2010-10-20 4:30", "YYYY-MM-DD HH:mm"); // parsed as 4:30 local time
moment("2010-10-20 4:30 +0000", "YYYY-MM-DD HH:mm Z"); // parsed as 4:30 UTC
You can verify the date also:
moment("not a real date").isValid(); // false
moment("2010 13", "YYYY MM").isValid(); // false (not a real month)
moment("2010 11 31", "YYYY MM DD").isValid(); // false (not a real day)
moment("2010 2 29", "YYYY MM DD").isValid(); // false (not a leap year)
moment("2010 notamonth 29", "YYYY MMM DD").isValid(); // false (not a real month name)
You can create a Moment with a pre-existing native Javascript Date object.
var day = new Date(2011, 9, 16);
var dayWrapper = moment(day);
You can create a moment with an array of numbers that mirror the parameters passed to new Date()
[year, month, day, hour, minute, second, millisecond]
moment([2010, 1, 14, 15, 25, 50, 125]); // February 14th, 3:25:50.125 PM
Any value past the year is optional, and will default to the lowest possible number.
moment([2010]); // January 1st
moment([2010, 6]); // July 1st
moment([2010, 6, 10]); // July 10th

Using Moment to Validate Default Javascript Date Format

I want to use moment (or any other method) to validate a particular string as a valid date value based on the default javascript date format.
I have the following code:
var date = new Date(); // Tue Nov 28 2017 17:54:41 GMT-0600 (CST)
I want to take that string output and use moment to validate that as a valid date string. I know I can do this:
moment(date, moment.ISO_8601).isValid();
But there is a problem. Here are the results for the same date values:
moment(new Date(), moment.ISO_8601).isValid(); //True
moment("Tue Nov 28 2017 17:54:41 GMT-0600 (CST)", moment.ISO_8601).isValid() //False
Which is not what I want since both of them should be true. I can't do new Date(...) because here's the results for that approach:
moment(new Date("Tue Nov 28 2017 17:54:41 GMT-0600 (CST)"), moment.ISO_8601).isValid(); //True
moment(new Date("3"), moment.ISO_8601).isValid(); //True
This also is not what I want since the second line should be false.
How do I properly valid a string as a valid date only if it strictly follows the format Tue Nov 28 2017 17:54:41 GMT-0600 (CST)?
I have researched everywhere to understand what format Tue Nov 28 2017 17:54:41 GMT-0600 (CST) is but I can't find anything. It's not ISO 8601 and not RFC 2822 either.

As RobG stated in the comments There is no "default javascript date format". The output from Date.prototype.toString is implementation dependent
Since your input is neither in ISO 8601 nor in RFC 2822 Date time formats you have to use moment(String, String) using 'ddd MMM D YYYY HH:mm:ss [GMT]Z' as format parameter. If you want that your string matches strictly your format, you can use strict mode (moment(String, String, Boolean)).
Please note that moment does not provide token for parsing timezone abbreviation (e.g. CST), so your input will not be recognized in strict mode. Here an example of parsing using both strict and forgiving mode; myIsValid function is an example of removing timezone abbreviation from the input.
var s = 'Tue Nov 28 2017 17:54:41 GMT-0600 (CST)';
var fmt = 'ddd MMM D YYYY HH:mm:ss [GMT]Z';
console.log(moment(s, fmt).isValid());
console.log(moment(s, fmt, true).isValid());
function myIsValid(input){
// Check if input contains ()
var idxl = input.indexOf('(');
var idxr = input.indexOf(')');
if( idxl>0 && idxr>0 ){
// Remove timezone abbreviation
input = input.substr(0, idxl-1);
}
var fmt = 'ddd MMM D YYYY HH:mm:ss [GMT]Z';
return moment(input, fmt, true).isValid();
}
console.log(myIsValid(s));
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
Lastest version of moment (2.19.2), gives Invalid Date even with forgiving mode. Using parsingFlags() you see that weekdayMismatch is true, I think this is an issue of the 2.19+ version of moment this is related to moment #4227 issue.
var s = 'Tue Nov 28 2017 17:54:41 GMT-0600 (CST)';
var fmt = 'ddd MMM D YYYY HH:mm:ss [GMT]Z';
var m1 = moment(s, fmt);
var m2 = moment(s, fmt, true);
console.log(m1.isValid());
console.log(m1.parsingFlags());
console.log(m2.isValid());
console.log(m2.parsingFlags());
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.19.2/moment.min.js"></script>

If you want to strictly validate a timestamp with Moment.js, use the strict flag when parsing:
var s = 'Tue Nov 28 2017 17:54:41 GMT-0600';
s = s.replace('GMT','');
console.log('Modified string: ' + s);
var mStrict = moment(s, 'ddd MMM D YYYY HH:mm:ss ZZ', true);
console.log('Strict parse: ' + mStrict.format());
var mLoose = moment(s, 'ddd MMM D YYYY HH:mm:ss ZZ');
console.log('Loose parse : ' + mLoose.format());
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.19.2/moment.min.js"></script>
However, for me both strict and loose produce "Invalid date", which is incorrect (and should be "Invalid Date"). The issue seems to be the timezone value or token.

momentJS convert possibility day into Date() js format

I am trying to convert a date in format momentjs into a date from javascript native new Date().
The problem is that if I have moment(myDay).toDate(); it converts to the current date, and I want the date from myDay.
myDay looks like: "YYYY-MM-DD" => 2017-11-24 and I would like to have it with the format: Fri Nov 24 2017 20:17:11 GMT+0100 (Hora estándar romance) but I get Thu Nov 16 2017 etc...
It is possible to convert it like that way?

Don't need moment:
let [yr, mn, day] = myDay.split('-').map(Number);
// note that JS months are 0-11 not 1-12
let datestr = new Date(yr, mn - 1, dy).toString();
console.log(datestr); // "Fri Nov 24 2017 00:00:00 GMT-0500 (EST)"

you want something like this:
moment(myDay, "YYYY-MM-DD").toString();
moment().toString() Returns an english string in a similar format to JS Date's .toString().
moment().toString() // "Sat Apr 30 2016 16:59:46 GMT-0500"

Javascript date format issue to string

When I convert from date to String, my date is changing. What is the my fault?
Date is returned me:
Date 2016-10-31T22:00:00.000Z
And when I convert to String I get:
Thu Dec 01 2016 00:00:00 GMT+0200
My code:
date = new Date("2016 11 31");
StringDate = date.toString();
console.log(StringDate);
console.log(date);

You're after UTC time, which can be printed with Date.toUTCString():
var date = new Date("2016 11 31");
var stringDate = date.toUTCString(); // See this line
console.log(stringDate);
console.log(date);

Actually your input is wrong.There is no such date 2016-11-31. Thats why it shows Dec 01 2016.
Try this:
date=new Date("2016 10 31"); //november consist 30 days only
StringDate=date.toString();
console.log(StringDate);
console.log(date);