Develop Reference

How to apply moment.js to existing variables in html

Is there a way to form the current date and time into a moment.js using these variables?
var x = new Date(document.lastModified);
var y = new Date();
document.writeln('The last modified date is: ' + x + ' and Date is: ' + y);

const last = moment(document.lastModified, "MM/DD/YYYY");
const now = moment();
document.write('The last modified date is: ' + last.format("YYYY-MM-DD") + ' and Date is: ' + now.format("YYYY-MM-DD"));
<script src="https://momentjs.com/downloads/moment.js"></script>

You can use n.toISOString(); to convert your date to ISO format and then parse it in momentjs.
var date = moment(n.toISOString()).format('DD-MM-YYYY');
Example:
var n = new Date();
n.toISOString();
var date = moment(n.toISOString()).format('DD-MM-YYYY');
console.log(date);

Javascript format date

I have a date string which coming from the db as follows
/Date(1469167371657)/
Is there any way to convert this date to following format using javascript
MM/DD/YYYY HH:MM
I've searched a lot but unble to find a solution

In plain javascript you have to write your own function for string format a date, for example for your string format:
var date = new Date(1469167371657);
function stringDate(date) {
var mm = date.getMonth()+1;
mm = (mm<10?"0"+mm:mm);
var dd = date.getDate();
dd = (dd<10?"0"+dd:dd);
var hh = date.getHours();
hh = (hh<10?"0"+hh:hh);
var min = date.getMinutes();
min = (min<10?"0"+min:min);
return mm+'/'+dd+'/'+date.getFullYear()+" "+hh+":"+min;
}
console.log(stringDate(date));
drier code version
var date = new Date(1469167371657);
function stringDate(date) {
return ("0" + (date.getMonth() + 1)).slice(-2)+'/'
+("0" + date.getDate()).slice(-2)+'/'
+date.getFullYear()+" "
+("0" + date.getHours()).slice(-2)+':'
+("0" + date.getMinutes()).slice(-2)
}
console.log(stringDate(date));

with pure js you can do the folowing
var d = new Date();
console.log(d.getMonth() + 1 + "/" + d.getDate() + "/" + d.getFullYear() + " " + d.getHours() + ":" + d.getMinutes())

You can use - http://momentjs.com/ and have it done like:
moment(1469167371657).format('MM/DD/YYYY HH:MM')

You can do this with the following steps:
1) convert the timestamp to a date object.
var timestamp = "/Date(1469167371657)/"; // However you want to save whatever comes from your database
timestamp = timestamp.substr(timestamp.indexOf("(")+1); // gives 1469167371657)/
timestamp = timestamp.substr(0,timestamp.indexOf(")")); // gives 1469167371657
var d = new Date(timestamp);
2) set it to your format
function leadZero(i) {if(i < 10) {return "0"+i;} return i;} // Simple function to convert 5 to 05 e.g.
var time = leadZero(d.getMonth()+1)+"/"+leadZero(d.getDate())+"/"+d.getFullYear()+" "+leadZero(d.getHours())+":"+leadZero(d.getMinutes());
alert(time);
Note: the date / timestamp you provided is too high for javascript to understand, so this example will not work correclty

I believe that number is milliseconds so to convert it to date, you would do this:
var time = new Date().getTime();
var date = new Date(time);
alert(date.toString()); // Wed Jan 12 2011 12:42:46 GMT-0800 (PST)
var time=1469167371657;
var date = new Date(time);
alert(date.toString());

Convert DD-MM-YYYY to YYYY-MM-DD format using Javascript

I'm trying to convert date format (DD-MM-YYYY) to (YYYY-MM-DD).i use this javascript code.it's doesn't work.
function calbill()
{
var edate=document.getElementById("edate").value; //03-11-2014
var myDate = new Date(edate);
console.log(myDate);
var d = myDate.getDate();
var m = myDate.getMonth();
m += 1;
var y = myDate.getFullYear();
var newdate=(y+ "-" + m + "-" + d);
alert (""+newdate); //It's display "NaN-NaN-NaN"
}

This should do the magic
var date = "03-11-2014";
var newdate = date.split("-").reverse().join("-");

Don't use the Date constructor to parse strings, it's extremely unreliable. If you just want to reformat a DD-MM-YYYY string to YYYY-MM-DD then just do that:
function reformatDateString(s) {
var b = s.split(/\D/);
return b.reverse().join('-');
}
console.log(reformatDateString('25-12-2014')); // 2014-12-25

You can use the following to convert DD-MM-YYYY to YYYY-MM-DD format using JavaScript:
var date = "24/09/2018";
date = date.split("/").reverse().join("/");
var date2 = "24-09-2018";
date2 = date.split("-").reverse().join("-");
console.log(date); //print "2018/09/24"
console.log(date2); //print "2018-09-24"

You just need to use return newdate:
function calbill()
{
var edate=document.getElementById("edate").value;
var myDate = new Date(edate);
console.log(myDate);
var d = myDate.getDate();
var m = myDate.getMonth();
m += 1;
var y = myDate.getFullYear();
var newdate=(y+ "-" + m + "-" + d);
return newdate;
}
demo
But I would simply recommend you to use like #Ehsan answered for you.

First yo have to add a moment js cdn which is easily available at here
then follow this code
moment(moment('13-01-2020', 'DD-MM-YYYY')).format('YYYY-MM-DD');
// will return 2020-01-13

Convert UTC Date to dd/mm/yyyy Format

I am having some difficulties when trying to convert UTC Date format to dd/mm/yyyy in JavaScript:
var launchDate = attributes["launch_date"];
if (isBuffering) {
var date = new Date(launchDate);
var d = new Date(date.toLocaleDateString());
launchDate = ((d.getUTCMonth() + 1) + "/" + (d.getUTCDate() + 1) + "/" + (d.getUTCFullYear()));
}
I tried with this, but it returns me an invalid date. So I changed to this:
var launchDate = attributes["launch_date"];
if (isBuffering) {
var date = new Date(launchDate);
var d = formatDate(new Date(date.toLocaleDateString()));
launchDate = ((d.getUTCMonth() + 1) + "/" + (d.getUTCDate() + 1) + "/" + (d.getUTCFullYear()));
}
However, it still returning me invalid Date. I wonder is there any possible way to change the date format of Fri May 31 2013 17:41:01 GMT+0200 (CEST) to dd/mm/yyyy?
Thanks in advance.

var d = new Date();
var n = d.toLocaleDateString();
This will be more superior in build JS method!

function formatDate(d)
{
date = new Date(d)
var dd = date.getDate();
var mm = date.getMonth()+1;
var yyyy = date.getFullYear();
if(dd<10){dd='0'+dd}
if(mm<10){mm='0'+mm};
return d = dd+'/'+mm+'/'+yyyy
}

Try it:
Date.parseExact(Your_Date, 'dd/MM/yyyy').toString('MM/dd/yyyy');
or
Date.parseExact(Your_Date, 'MM/dd/yyyy').toString('dd/MM/yyyy');

Month is 0 indexed, but day is not. You don't need to add 1 to your day.
Also, you're formatting it for MM/dd/yyyy, not dd/MM/yyyy.
solution:
var launchDate = attributes["launch_date"];
if (isBuffering) {
var date = new Date(launchDate);
var d = formatDate(new Date(date.toLocaleDateString()));
launchDate = ((d.getUTCDate())+ "/" + (d.getUTCMonth() + 1) + "/" + (d.getUTCFullYear()));
}

jQuery: Add 4 weeks to date in format dd-mm-yyyy

I have a string which has a date in the format: dd-mm-yyyy
How I can add 4 weeks to the string and then generate a new string using jQuery / Javascript?
I have
var d = new Date(current_date);
d.setMonth(d.getMonth() + 1);
current_date_new = (d.getMonth() + 1 ) + '-' + d.getDate() + '-' + d.getFullYear();
alert(current_date_new);
but it complains that the string provided is in the incorrect format

EDIT: After a bit of fiddling, here's the solution:
First, split the string to individual parts.
var inputString = "12-2-2005";
var dString = inputString.split('-');
Then, parse the string to a datetime object and add 28 days (4 weeks) to it.
var dt = new Date(dString[2],dString[1]-1,dString[0]);
dt.setDate(dt.getDate()+28);
Finally, you can output the date
var finalDate = dt.GetDate() + "-" + (dt.GetMonth()+1) + "-" + dt.GetYear();
This code should return 12-3-2005.
CAVEATS: It seems JavaScript's Date object takes 0-11 as the month field, hence the -1 and +1 to the month in the code.
EDIT2: To do padding, use this function:
function pad(number, length) {
var str = '' + number;
while (str.length < length) {
str = '0' + str;
}
return str;
}
and change your output to
var finalDate = pad(dt.GetDate(),2) + "-" + pad(dt.GetMonth()+1,2) + "-" + dt.GetYear();
Check the updated fiddle.

There is no need to convert to mm-dd-yyyy, simple split string by the minus sign and create new Date object with the following code:
var string = '12-02-2012';
var split = string.split('-');
var date = Date(split[2],parseInt(split[1])-1,parseInt(split[0])+1)
date.setDate(date.getDate() + 28);
var fourWeeksLater = date.getDay() + "-"+date.getMonth() +"-"+date.getYear();

This should be working:
var formattedDate = '01-01-2012',
dateTokens = formattedDate.split('-'),
dt = new Date(dateTokens[2], parseInt( dateTokens[1], 10 ) - 1, dateTokens[0]), // months are 0 based, so need to add 1
inFourWeeks = new Date( dt.getTime() + 28 * 24 * 60 * 60 * 1000 );
jsfiddle: http://jsfiddle.net/uKDJP/
Edit:
Using Globalize you can format inFourWeeks:
Globalize.format( inFourWeeks, 'dd-MM-yyyy' ) // outputs 29-01-2012

Instead of writing your own parser for dates, I would use moment.js.
To parse your date:
var date = moment('14-06-2012', 'DD-MM-YYYY');
To add 4 weeks to it:
date.add('weeks', 4);
Or in one go:
var date = moment('14-06-2012', 'DD-MM-YYYY').add('weeks', 4);
And convert it to string:
var dateString = date.format('DD-MM-YYYY');