We Keep Coding

convert only time String to Timestamp

So what I have is a time string which shows the time as h:m:s.ms
But the problem is that I want to covert them to timestamp values it shows NaN values.
I am using Date.parse() to convert the time into timestamp.
Here is the code that I have tried.
var date;
function myFunction() {
var d = new Date();
var h = addZero(d.getHours(), 2);
var m = addZero(d.getMinutes(), 2);
var s = addZero(d.getSeconds(), 2);
var ms = addZero(d.getMilliseconds(), 3);
var maindate = h + ":" + m + ":" + s + "." + ms ;
var datestring = Date.parse(maindate)
var data = Math.random(0,1);
console.log("Date : ", maindate) ;
console.log("Data : ", data);
}
myFunction();
You can see the date and data in the console window.
the date variable here shows NaN Value.
Please tell me what I am doing wrong.

If you want a timestamp you need a full time with day, month and year
var date;
function myFunction() {
var d = new Date();
var h = addZero(d.getHours(), 2);
var m = addZero(d.getMinutes(), 2);
var s = addZero(d.getSeconds(), 2);
var ms = addZero(d.getMilliseconds(), 3);
var day = d.getDate();
var month = d.getMonth() + 1; // getMonth returns an integer between 0 and 11
var year = d.getFullYear();
var maindate = `${day}-${month}-${year} ${h}:${m}:${s}.${ms}`;
var datestring = Date.parse(maindate)
console.log("Data : ", datestring);
}
myFunction();

Parsing dates is a pain in JavaScript as there's no extensive native support. However you could do something like the following by relying on the Date(year, month, day [, hour, minute, second, millisecond]) constructor signature of the Date object.
var dateString = '17-09-2013 10:08',
dateTimeParts = dateString.split(' '),
timeParts = dateTimeParts[1].split(':'),
dateParts = dateTimeParts[0].split('-'),
date;
date = new Date(dateParts[2], parseInt(dateParts[1], 10) - 1, dateParts[0], timeParts[0], timeParts[1]);
console.log(date.getTime()); //1379426880000
console.log(date); //Tue Sep 17 2013 10:08:00 GMT-0400
You could also use a regular expression with capturing groups to parse the date string in one line.
var dateParts = '17-09-2013 10:08'.match(/(\d+)-(\d+)-(\d+) (\d+):(\d+)/);
console.log(dateParts); // ["17-09-2013 10:08", "17", "09", "2013", "10", "08"]

As I want to get the timestamp in result. I got my sholution of the above question that I posted
Here is the Final code which is giving me the expected result.
function addZero(x,n) {
while (x.toString().length < n) {
x = "0" + x;
}
return x;
}
var date;
function myFunction() {
var d = new Date();
var day = d.getDate();
var month = d.getMonth() + 1; // Since getMonth() returns month from 0-11 not 1-12
var year = d.getFullYear();
var h = addZero(d.getHours(), 2);
var m = addZero(d.getMinutes(), 2);
var s = addZero(d.getSeconds(), 2);
var ms = addZero(d.getMilliseconds(), 3);
var maindate = year +"-" + day + "-" + month +" "+ h + ":" + m + ":" + s + "." + ms ;
var datestring = Date.parse(maindate)
var data = Math.random(0,1);
console.log("Date : ", datestring) ;
console.log("Data : ", data);
}
myFunction();
I had to include the day month and year value also. WHich I updated in the Answer. rest of the code works fine.

For this, you don't need your addZero() function any more and it's unnecessary to delacre var date; globally.
var d = new Date();
var h = d.getHours();
var m = d.getMinutes();
var s = d.getSeconds();
var ms = d.getMilliseconds();
var day = d.getDate();
var month = d.getMonth() + 1;
var year = d.getFullYear();
var maindate = day + '-' + month + '-' + year + ' ' + h + ':' + m + ':' + s + '.' + ms;
var datestring = Date.parse(maindate);
console.log("Data : ", datestring);
Take a look at momentjs.com, maybe this could be a clean and simple solution for you too - depending on your environment.

Why am I getting this error for JavaScript Date object?

I wrote the following code in JS
var d = new Date(2019, 9, 14);
var currentTime = d.getTime();
var daysToAdd = 3;
var secondsInDay = 86400;
var d = new Date(currentTime + daysToAdd*secondsInDay);
var year = d.getFullYear();
var month = ("0" + (d.getMonth())).slice(-2);
var day = ("0" + d.getDate()).slice(-2);
console.log('result in Y-M-D is: ' + year + '-' + month + '-' + day);
This outputs to result in Y-M-D is: 2019-09-14
What am I doing wrong here? How to I change this to output result in Y-M-D is: 2019-09-17 , which I originally intended to do

This happens because on this code
new Date(currentTime + daysToAdd*secondsInDay);
secondsInDay is a representation in seconds, and currentTime is represented in ms. If you multiply your secondsInDay by 1000 (to get the equivalent value in ms) you will get the desired date.

Instead of
var d = new Date(currentTime + daysToAdd*secondsInDay);
you can use
d.setDate(new Date().getDate()+3);

Youre problem is that the constructor of the date object uses MILISECONDS to calculate the date, and you're using SECONDS to add that 3 extra days. Instead of 86400 (seconds) you need to use the value 86400000 (miliseconds).
Goodbye!

You can add the number of days directly to d.getDate()
var d = new Date(2019, 9, 14);
var daysToAdd = 3;
var new_day = d.getDate() + daysToAdd;
var new_d = new Date(d.getFullYear(), d. getMonth(), new_day);
alert('result in Y-M-D is: ' + new_d.getFullYear() + '-' + new_d. getMonth() + '-' + new_day);

Javascript n months after today

I am trying to get the day 90 days after today. This is my code:
var today = new Date();
var threeMonthsFromToday = new Date(today.setDate(today.getDate() + 90));
When I print threeMonthsFromToday, I get the correct date: 2017-04-24T15:17:42.641Z. However, when I try to reformat the date to be in the form dd/mm/yyyy using this code:
var day = ('0' + threeMonthsFromToday.getDate()).slice(-2);
var month = ('0' + threeMonthsFromToday.getMonth() + 1).slice(-2);
var year = threeMonthsFromToday.getFullYear();
var date = day + '/' + month + '/' + year;
I get a completely different and invalid date: 24/31/2017.
I have been debugging this for hours and still can't seem to figure what I am doing wrong.

Well, '0' + threeMonthsFromToday.getMonth() give you a string : "03" then you add 1 converted to string giving you "031" for month before slice.
Use this :
var month = ('0' + (threeMonthsFromToday.getMonth() + 1)).slice(-2);

You are missing the basic BODMAS rule here please modify your code as follows
var today = new Date();
var threeMonthsFromToday = new Date(today.setDate(today.getDate() + 90));
var day = ('0' + threeMonthsFromToday.getDate()).slice(-2);
var month = ('0' + (threeMonthsFromToday.getMonth() + 1)).slice(-2);
var year = threeMonthsFromToday.getFullYear();
var date = day + '/' + month + '/' + year;
the operations are performed from left to right, so month is getting converted to string before being added to a number. Including a bracket will first perform operation inside bracket and then make it a string

Can you use toLocaleString?
threeMonthsFromToday.toLocaleDateString('en-GB')

Below does the trick for you ...
getMonth() +1 before adding the "0" to it so that you get an arithematic +1
var today = new Date();
var threeMonthsFromToday = new Date(today.setDate(today.getDate() + 90));
var day = ('0' + threeMonthsFromToday.getDate()).slice(-2);
var month = ('0' + (threeMonthsFromToday.getMonth()+1)).slice(-2);
var year = threeMonthsFromToday.getFullYear();
var date = day + '/' + month + '/' + year;
console.log(date);

This should work.
var day = threeMonthsFromToday.getDate()
if(day < 10){
day = '0' + day
}
var month = threeMonthsFromToday.getMonth()+1
if(month<10){
month = '0' + month
}
var year = threeMonthsFromToday.getFullYear()
var date = day + '/' + month + '/' + year

Use Simple toLocaleDateString method
The toLocaleDateString() method returns a string with a language sensitive representation of the date portion of this date.
var today = new Date();
var threeMonthsFromToday = new Date(today.setDate(today.getDate() + 90));
var date = threeMonthsFromToday.toLocaleDateString();
console.log(date);
//result in console : "24/04/2017"
Try it out on your console.

Date and time in javascript

How can I get the date and time in javascript as 12/08/2015-1:49? I tried the following but I get an error TypeError: now.format is not a function
var now = new Date();
now.format("dd/mm/yy-h:mm tt");
console.log(now); //TypeError: now.format is not a function

There is no any format method for Date in JavaScript. Either you need to use any other external libraries like momentjs, or write your own script to format.
Here is example how you can convert date to dd/mm/yy-h:mm tt format
var now = new Date();
var date = now.getDate() + "/" + (now.getMonth() + 1) + "/" + now.getFullYear() + "-" + now.getHours() + ":" + now.getMinutes() + " " + (now.getHours() > 12 ? "PM" : "AM");
console.log(date)

Try this:
function getFormattedDate() {
var date = new Date();
var str = date.getDate() + "/" + (date.getMonth() + 1) + "/" + date.getYear() + "-" + date.getHours() + ":" + date.getMinutes() + " " + date.getSeconds();
return str;
}

Extend Date`s prototype, add function format
Date.prototype.format = function(format){
format = format || "Y/M/D H:I:S";
var data = {
y: this.getFullYear() % 100,
Y: this.getFullYear(),
m: this.getMonth() + 1,
d: this.getDate(),
h: this.getHours(),
i: this.getMinutes(),
s: this.getSeconds()
};
var needAddZeroLTTen = "mdhis".split('');
for(var i = 0; i < needAddZeroLTTen.length; i ++){
var prop = needAddZeroLTTen[i];
data[prop.toUpperCase()] = data[prop] < 10 ? ('0' + data[prop]) : data[prop];
}
var dateStr = format;
for(var i in data){
var reg = new RegExp(i,'g');
dateStr = dateStr.replace(reg, data[i]);
}
return dateStr;
}
Then use below code to format a date
var date = new Date();
var dateStr = date.format('D/M/y-h:I');

the best way to manage dates in js is using http://momentjs.com/ here you will find a great way to format the dates

You can either
do this by hand by using the functions on Date like date.getMonth(), however these do not support zero padding, and it gets quite fiddly. Only do this if you cannot include a third-party library, you're obsessive about load time / performance or you really enjoy re-inventing the wheel.
Use a third-party library like moment, this has multiple formats and supports padding, e.g. MM will force month as two characters.
Example
var now = new Date();
console.log(moment(now).format("DD/MM/YY-hh:mm Z"));

Moment.JS would help you.
Please take a look on this JSFiddle: http://jsfiddle.net/f3zp5zuv/
alert (moment('2015 Apr 30').format('DD/MM/YY -h:mm'))
Moment: http://momentjs.com/docs/#/displaying/
alert (moment('2015 Apr 30 14:42:00').format('DD/MM/YY -h:mm'))
<script src="http://momentjs.com/downloads/moment.js"></script>

How to get current date in jQuery?

I want to know how to use the Date() function in jQuery to get the current date in a yyyy/mm/dd format.

Date() is not part of jQuery, it is one of JavaScript's features.
See the documentation on Date object.
You can do it like that:
var d = new Date();
var month = d.getMonth()+1;
var day = d.getDate();
var output = d.getFullYear() + '/' +
(month<10 ? '0' : '') + month + '/' +
(day<10 ? '0' : '') + day;
See this jsfiddle for a proof.
The code may look like a complex one, because it must deal with months & days being represented by numbers less than 10 (meaning the strings will have one char instead of two). See this jsfiddle for comparison.

If you have jQuery UI (needed for the datepicker), this would do the trick:
$.datepicker.formatDate('yy/mm/dd', new Date());

jQuery is JavaScript. Use the Javascript Date Object.
var d = new Date();
var strDate = d.getFullYear() + "/" + (d.getMonth()+1) + "/" + d.getDate();

Using pure Javascript your can prototype your own YYYYMMDD format;
Date.prototype.yyyymmdd = function() {
var yyyy = this.getFullYear().toString();
var mm = (this.getMonth()+1).toString(); // getMonth() is zero-based
var dd = this.getDate().toString();
return yyyy + "/" + (mm[1]?mm:"0"+mm[0]) + "/" + (dd[1]?dd:"0"+dd[0]); // padding
};
var date = new Date();
console.log( date.yyyymmdd() ); // Assuming you have an open console

In JavaScript you can get the current date and time using the Date object;
var now = new Date();
This will get the local client machine time
Example for jquery LINK
If you are using jQuery DatePicker you can apply it on any textfield like this:
$( "#datepicker" ).datepicker({dateFormat:"yy/mm/dd"}).datepicker("setDate",new Date());

function GetTodayDate() {
var tdate = new Date();
var dd = tdate.getDate(); //yields day
var MM = tdate.getMonth(); //yields month
var yyyy = tdate.getFullYear(); //yields year
var currentDate= dd + "-" +( MM+1) + "-" + yyyy;
return currentDate;
}
Very handy function to use it, Enjoy. You do not require any javascript framework. it just works in with plain javascript.

I know I am Late But This Is All You Need
var date = (new Date()).toISOString().split('T')[0];
toISOString() use built function of javascript.
cd = (new Date()).toISOString().split('T')[0];
console.log(cd);
alert(cd);

Since the question is tagged as jQuery:
If you are also using jQuery UI you can use $.datepicker.formatDate():
$.datepicker.formatDate('yy/mm/dd', new Date());
See this demo.

Here is method top get current Day, Year or Month
new Date().getDate() // Get the day as a number (1-31)
new Date().getDay() // Get the weekday as a number (0-6)
new Date().getFullYear() // Get the four digit year (yyyy)
new Date().getHours() // Get the hour (0-23)
new Date().getMilliseconds() // Get the milliseconds (0-999)
new Date().getMinutes() // Get the minutes (0-59)
new Date().getMonth() // Get the month (0-11)
new Date().getSeconds() // Get the seconds (0-59)
new Date().getTime() // Get the time (milliseconds since January 1, 1970)

See this.
The $.now() method is a shorthand for the number returned by the expression (new Date).getTime().

Moment.js makes it quite easy:
moment().format("YYYY/MM/DD")

this object set zero, when element has only one symbol:
function addZero(i) {
if (i < 10) {
i = "0" + i;
}
return i;
}
This object set actual full time, hour and date:
function getActualFullDate() {
var d = new Date();
var day = addZero(d.getDate());
var month = addZero(d.getMonth()+1);
var year = addZero(d.getFullYear());
var h = addZero(d.getHours());
var m = addZero(d.getMinutes());
var s = addZero(d.getSeconds());
return day + ". " + month + ". " + year + " (" + h + ":" + m + ")";
}
function getActualHour() {
var d = new Date();
var h = addZero(d.getHours());
var m = addZero(d.getMinutes());
var s = addZero(d.getSeconds());
return h + ":" + m + ":" + s;
}
function getActualDate() {
var d = new Date();
var day = addZero(d.getDate());
var month = addZero(d.getMonth()+1);
var year = addZero(d.getFullYear());
return day + ". " + month + ". " + year;
}
HTML:
<span id='full'>a</span>
<br>
<span id='hour'>b</span>
<br>
<span id='date'>c</span>
JQUERY VIEW:
$(document).ready(function(){
$("#full").html(getActualFullDate());
$("#hour").html(getActualHour());
$("#date").html(getActualDate());
});
EXAMPLE

//convert month to 2 digits<p>
var twoDigitMonth = ((fullDate.getMonth().length+1) === 1)? (fullDate.getMonth()+1) : '0' + (fullDate.getMonth()+1);
var currentDate = fullDate.getFullYear()+ "/" + twoDigitMonth + "/" + fullDate.getDate();
console.log(currentDate);<br>
//2011/05/19

You can achieve this with moment.js as well.
Include moment.js in your html.
<script src="moment.js"></script>
And use below code in script file to get formatted date.
moment(new Date(),"YYYY-MM-DD").utcOffset(0, true).format();

FYI - getDay() will give you the day of the week... ie: if today is Thursday, it will return the number 4 (being the 4th day of the week).
To get a proper day of the month, use getDate().
My example below... (also a string padding function to give a leading 0 on single time elements. (eg: 10:4:34 => 10:04:35)
function strpad00(s)
{
s = s + '';
if (s.length === 1) s = '0'+s;
return s;
}
var currentdate = new Date();
var datetime = currentdate.getDate()
+ "/" + strpad00((currentdate.getMonth()+1))
+ "/" + currentdate.getFullYear()
+ " # "
+ currentdate.getHours() + ":"
+ strpad00(currentdate.getMinutes()) + ":"
+ strpad00(currentdate.getSeconds());
Example output: 31/12/2013 # 10:07:49If using getDay(), the output would be 4/12/2013 # 10:07:49

This will give you current date string
var today = new Date().toISOString().split('T')[0];

Try this....
var d = new Date();
alert(d.getFullYear()+'/'+(d.getMonth()+1)+'/'+d.getDate());
getMonth() return month 0 to 11 so we would like to add 1 for accurate month
Reference by : https://www.w3schools.com/jsref/jsref_obj_date.asp

you can use this code:
var nowDate = new Date();
var nowDay = ((nowDate.getDate().toString().length) == 1) ? '0'+(nowDate.getDate()) : (nowDate.getDate());
var nowMonth = ((nowDate.getMonth().toString().length) == 1) ? '0'+(nowDate.getMonth()+1) : (nowDate.getMonth()+1);
var nowYear = nowDate.getFullYear();
var formatDate = nowDay + "." + nowMonth + "." + nowYear;
you can find a working demo here

var d = new Date();
var today = d.getFullYear() + '/' + ('0'+(d.getMonth()+1)).slice(-2) + '/' + ('0'+d.getDate()).slice(-2);

The jQuery plugin page is down. So manually:
function strpad00(s)
{
s = s + '';
if (s.length === 1) s = '0'+s;
return s;
}
var now = new Date();
var currentDate = now.getFullYear()+ "/" + strpad00(now.getMonth()+1) + "/" + strpad00(now.getDate());
console.log(currentDate );

console.log($.datepicker.formatDate('yy/mm/dd', new Date()));

Using the jQuery-ui datepicker, it has a handy date conversion routine built in so you can format dates:
var my_date_string = $.datepicker.formatDate( "yy-mm-dd", new Date() );
Simple.

This is what I came up with using only jQuery. It's just a matter of putting the pieces together.
//Gather date information from local system
var ThisMonth = new Date().getMonth() + 1;
var ThisDay = new Date().getDate();
var ThisYear = new Date().getFullYear();
var ThisDate = ThisMonth.toString() + "/" + ThisDay.toString() + "/" + ThisYear.toString();
//Gather time information from local system
var ThisHour = new Date().getHours();
var ThisMinute = new Date().getMinutes();
var ThisTime = ThisHour.toString() + ":" + ThisMinute.toString();
//Concatenate date and time for date-time stamp
var ThisDateTime = ThisDate + " " + ThisTime;

You can do this:
var now = new Date();
dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
// Saturday, June 9th, 2007, 5:46:21 PM
OR Something like
var dateObj = new Date();
var month = dateObj.getUTCMonth();
var day = dateObj.getUTCDate();
var year = dateObj.getUTCFullYear();
var newdate = month + "/" + day + "/" + year;
alert(newdate);

var d = new Date();
var month = d.getMonth() + 1;
var day = d.getDate();
var year = d.getYear();
var today = (day<10?'0':'')+ day + '/' +(month<10?'0':'')+ month + '/' + year;
alert(today);

I just wanted to share a timestamp prototype I made using Pierre's idea. Not enough points to comment :(
// US common date timestamp
Date.prototype.timestamp = function() {
var yyyy = this.getFullYear().toString();
var mm = (this.getMonth()+1).toString(); // getMonth() is zero-based
var dd = this.getDate().toString();
var h = this.getHours().toString();
var m = this.getMinutes().toString();
var s = this.getSeconds().toString();
return (mm[1]?mm:"0"+mm[0]) + "/" + (dd[1]?dd:"0"+dd[0]) + "/" + yyyy + " - " + ((h > 12) ? h-12 : h) + ":" + m + ":" + s;
};
d = new Date();
var timestamp = d.timestamp();
// 10/12/2013 - 2:04:19

Get current Date format dd/mm/yyyy
Here is the code:
var fullDate = new Date();
var twoDigitMonth = ((fullDate.getMonth().toString().length) == 1)? '0'+(fullDate.getMonth()+1) : (fullDate.getMonth()+1);
var twoDigitDate = ((fullDate.getDate().toString().length) == 1)? '0'+(fullDate.getDate()) : (fullDate.getDate());
var currentDate = twoDigitDate + "/" + twoDigitMonth + "/" + fullDate.getFullYear();
alert(currentDate);

function createDate() {
var date = new Date(),
yr = date.getFullYear(),
month = date.getMonth()+1,
day = date.getDate(),
todayDate = yr + '-' + month + '-' + day;
console.log("Today date is :" + todayDate);

You can add an extension method to javascript.
Date.prototype.today = function () {
return ((this.getDate() < 10) ? "0" : "") + this.getDate() + "/" + (((this.getMonth() + 1) < 10) ? "0" : "") + (this.getMonth() + 1) + "/" + this.getFullYear();
}

This one-liner will give you YYYY-MM-DD:
new Date().toISOString().substr(0, 10)
'2022-06-09'