Develop Reference

Unable to convert data '19-10-2002' into date

I need to pass a date parameter in format (dd-MM-yyyy) and convert in this format (yyyy-MM-dd) to send API.
So I do this:
convert(date:string){
date //is in the format(dd-MM-yyyy)
date =formatDate(date , "yyyy-MM-dd", 'en_US');
and I obtain this error:
Unable to convert "19-10-2002" into a date
Anyone can help me?

You could just do
console.log(
"19-10-2002".split('-').reverse().join('-')
)

If you want to pass a string to "formatDate" it has to be in "ISO date-time" format (the complete format is "YYYY-MM-DDThh:mm:ss.sTZD", but you can drop any part from the end and use like "YYYY" or "YYYY-MM-DD"). so the string you are passing to it is not recognized as a valid input date.
so you can use Dave's code

Here is the custom date formatter function which accepts date, format and separator/delimiter to convert the passed date with passed format.
function dateFormatter(date, format, delimiter) {
const dateItems = date.split(delimiter)
const formatItems = format.toLowerCase().split(delimiter);
const day = formatItems.indexOf('dd');
const month = formatItems.indexOf('mm');
const year = formatItems.indexOf('yyyy');
const formattedDate = ([dateItems[day], dateItems[month], dateItems[year]]).join(delimiter)
console.log(formattedDate)
return formattedDate
}
// run example
dateFormatter('02-03-2020', 'YYYY-MM-DD', '-');
dateFormatter('02/03/2020', 'MM/DD/YYYY', '/');

Parse date in Ext Js with / as separator

i am trying to parse a date in Ext JS as follows :
var date = new Date();
date = Ext.Date.parse("2/9/16","n/j/Y");
It creates an instance of the Date but when it tries to parse it, it returns undefined. I dont know where I am going wrong. Can anybody help?

Use y (a two digit representation of a year) instead of Y (a full numeric representation of a year, 4 digits):
Ext.Date.parse("2/9/16","n/j/y")

Try this
var date = Ext.util.Format.date( new Date(), "n/j/Y" );
console.log( date );

var Date = Ext.Date.format(new Date(), 'm/d/Y');

Convert date format 27.05.2015 01:46:32.UTC to Locale time

Can anyone help me to convert date format 27.05.2015 01:46:32.UTC to Locale time.
I tried the following code
var date = new Date('27.05.2015 01:46:32.UTC ');
date.toString();
This is also not working.
Even momentjs is also gives error to convert this format of date.

As per statement even momentjs is also gives error to convert this format of date, I have taken liberty and used momentjs here.
You need to use string-format moment constructor to pass string and format in which input string is.
Use
var t = "27.05.2015 01:46:32.UTC";
//pass dateTime string and its format, it will return
//moment object
var cdt = moment.utc(t, 'DD.MM.YYYY HH:mm:ss');
//Get date object
var date = cdt.toDate();
//Use date variable as per requiremnt
alert(date);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.3/moment.js"></script>

The format you are using for Date is DD.MM.YYYY. So you have to change this to MM.DD.YYYY for a valid java script object.
var date = '27.05.2015 01:46:32.UTC';
var date1 = date.split(' ');
console.log(date1)
var date2 = date1[0].split('.');
console.log(date2)
var date3 = date2[1]+ '.' +date2[0] +'.'+ date2[2];
console.log(date3)
var final_date = date3 + ' ' + date1[1];
console.log(final_date);
final_date.toString();

Javascript convert dates

I am getting this "20131218" date/time value from an API result.
What I want to do is convert this date into something like this "2013-12-18". I know this is very easy in PHP by simply doing this code:
echo date("Y-m-d",strtotime('20131218'));
output: 2013-12-18
This is what I tried in javascript:
var myDate = new Date("20131218");
console.log(myDate);
But the output is Date{ Invalid Date } so obviously this is wrong.
My question here what is the equivalent of strtotime in javascript? or if there's no equivalent, how would I convert this value as my expected result(2013-12-18) using javascript?
Your help will be greatly appreciated!
Thanks! :)

The value is invalid to convert it to date. So either from your PHP code send it as a proper format like 20131218
Or convert the value you get in your Javascript to similar kind of format.
var dateVal="20131218";
/*
// If it's number ******* //
var numdate=20131218;
var dateVal=numdate.toString();
*/
var year=dateVal.substring(0,4);
var mnth=dateVal.substring(4,6);
var day=dateVal.substring(6,8);
var dateString=year+"-"+mnth+"-"+day;
var actualDate = new Date(dateString);
alert(actualDate);
JSFIDDLE DEMO

Javascript has a Date.parse method but the string you have is not suitable to pass to it. You don't really need to create a date object just to format a string. Consider:
function formatDateStr(s) {
s = s.match(/\d\d/g);
return s[0] + s[1] + '-' + s[2] + '-' + s[3];
}
alert(formatDateStr('20131218')); // '2013-12-18'
If you wish to convert it to a date object, then:
function parseDateStr(s) {
s = s.match(/\d\d/g);
return new Date(s[0] + s[1], --s[2], s[3]);
}

The reason why it is showing Invalid date is, it wants it to be in format
Following format: YYYY-MM-DD or YYYY-MM-DDTHH:MM:SS
If you breakdown your string using following format just add dash at relevant places then you are good to go and use newDate.
1. var myDate = new Date("2013-12-18");
alert(myDate);
2. var myDate = new Date(2013,12,18);
Eventually you can modify your string manipulate it and use it in aforementioned format.

moment js extract year from string

I'm new to moment.js and I can't really understand the documentation. I'd like to manipulate some dates in string format.
I have my date as string from json feed and looks like:
var year = item.date
// it returns a string like "25/04/2012"
How do I extract the year from it using moment.js ?

You can use
moment("25/04/2012","DD/MM/YYYY").format("YYYY")
or
moment("25/04/2012","DD/MM/YYYY").year()
in your example:
moment(item.date,"DD/MM/YYYY").year()

Or you can convert the string to date then extract the year:
var date = new Date(dateString);
if (!isNaN(date)) {
return date.getFullYear();
}