Develop Reference

New Date () converting passed in yyyy-mm-dd to correct date minus one day [duplicate]

In my Java Script app I have the date stored in a format like so:
2011-09-24
Now when I try using the above value to create a new Date object (so I can retrieve the date in a different format), the date always comes back one day off. See below:
var date = new Date("2011-09-24");
console.log(date);
logs:
Fri Sep 23 2011 20:00:00 GMT-0400 (Eastern Daylight Time)

There are several crazy things that happen with a JS DATE object that convert strings, for example consider the following date you provided
Note: The following examples may or may not be ONE DAY OFF depending on YOUR timezone and current time.
new Date("2011-09-24"); // Year-Month-Day
// => Fri Sep 23 2011 17:00:00 GMT-0700 (MST) - ONE DAY OFF.
However, if we rearrange the string format to Month-Day-Year...
new Date("09-24-2011");
// => Sat Sep 24 2011 00:00:00 GMT-0700 (MST) - CORRECT DATE.
Another strange one
new Date("2011-09-24");
// => Fri Sep 23 2011 17:00:00 GMT-0700 (MST) - ONE DAY OFF AS BEFORE.
new Date("2011/09/24"); // change from "-" to "/".
// => Sat Sep 24 2011 00:00:00 GMT-0700 (MST) - CORRECT DATE.
We could easily change hyphens in your date "2011-09-24" when making a new date
new Date("2011-09-24".replace(/-/g, '\/')); // => "2011/09/24".
// => Sat Sep 24 2011 00:00:00 GMT-0700 (MST) - CORRECT DATE.
What if we had a date string like "2011-09-24T00:00:00"
new Date("2011-09-24T00:00:00");
// => Fri Sep 23 2011 17:00:00 GMT-0700 (MST) - ONE DAY OFF.
Now change hyphen to forward slash as before; what happens?
new Date("2011/09/24T00:00:00");
// => Invalid Date.
I typically have to manage the date format 2011-09-24T00:00:00 so this is what I do.
new Date("2011-09-24T00:00:00".replace(/-/g, '\/').replace(/T.+/, ''));
// => Sat Sep 24 2011 00:00:00 GMT-0700 (MST) - CORRECT DATE.
UPDATE
If you provide separate arguments to the Date constructor you can get other useful outputs as described below
Note: arguments can be of type Number or String. I'll show examples with mixed values.
Get the first month and day of a given year
new Date(2011, 0); // Normal behavior as months in this case are zero based.
// => Sat Jan 01 2011 00:00:00 GMT-0700 (MST)
Get the last month and day of a year
new Date((2011 + 1), 0, 0); // The second zero roles back one day into the previous month's last day.
// => Sat Dec 31 2011 00:00:00 GMT-0700 (MST)
Example of Number, String arguments. Note the month is March because zero based months again.
new Date(2011, "02");
// => Tue Mar 01 2011 00:00:00 GMT-0700 (MST)
If we do the same thing but with a day of zero, we get something different.
new Date(2011, "02", 0); // Again the zero roles back from March to the last day of February.
// => Mon Feb 28 2011 00:00:00 GMT-0700 (MST)
Adding a day of zero to any year and month argument will get the last day of the previous month. If you continue with negative numbers you can continue rolling back another day
new Date(2011, "02", -1);
// => Sun Feb 27 2011 00:00:00 GMT-0700 (MST)

Notice that Eastern Daylight Time is -4 hours and that the hours on the date you're getting back are 20.
20h + 4h = 24h
which is midnight of 2011-09-24. The date was parsed in UTC (GMT) because you provided a date-only string without any time zone indicator. If you had given a date/time string w/o an indicator instead (new Date("2011-09-24T00:00:00")), it would have been parsed in your local timezone. (Historically there have been inconsistencies there, not least because the spec changed more than once, but modern browsers should be okay; or you can always include a timezone indicator.)
You're getting the right date, you just never specified the correct time zone.
If you need to access the date values, you can use getUTCDate() or any of the other getUTC*() functions:
var d,
days;
d = new Date('2011-09-24');
days = ['Sun', 'Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'];
console.log(days[d.getUTCDay()]);

To normalize the date and eliminate the unwanted offset (tested here : https://jsfiddle.net/7xp1xL5m/ ):
var doo = new Date("2011-09-24");
console.log( new Date( doo.getTime() + Math.abs(doo.getTimezoneOffset()*60000) ) );
// Output: Sat Sep 24 2011 00:00:00 GMT-0400 (Eastern Daylight Time)
This also accomplishes the same and credit to #tpartee (tested here : https://jsfiddle.net/7xp1xL5m/1/ ):
var doo = new Date("2011-09-24");
console.log( new Date( doo.getTime() - doo.getTimezoneOffset() * -60000 ) );

I believe that it has to do with time-zone adjustment. The date you've created is in GMT and the default time is midnight, but your timezone is EDT, so it subtracts 4 hours. Try this to verify:
var doo = new Date("2011-09-25 EDT");

Just want to add that apparently adding a space at the end of the string will use UTC for creation.
new Date("2016-07-06")
> Tue Jul 05 2016 17:00:00 GMT-0700 (Pacific Daylight Time)
new Date("2016-07-06 ")
> Wed Jul 06 2016 00:00:00 GMT-0700 (Pacific Daylight Time)
Edit: This is not a recommended solution, just an alternative answer. Please do not use this approach since it is very unclear what is happening. There are a number of ways someone could refactor this accidentally causing a bug.

If you want to get hour 0 of some date in the local time zone, pass the individual date parts to the Date constructor.
new Date(2011,08,24); // month value is 0 based, others are 1 based.

if you need a simple solution for this see:
new Date('1993-01-20'.split('-'));

Your issue is specifically with time zone. Note part GMT-0400 - that is you're 4 hours behind GMT. If you add 4 hours to the displayed date/time, you'll get exactly midnight 2011/09/24. Use toUTCString() method instead to get GMT string:
var doo = new Date("2011-09-24");
console.log(doo.toUTCString());

This probably is not a good answer, but i just want to share my experience with this issue.
My app is globally use utc date with the format 'YYYY-MM-DD', while the datepicker plugin i use only accept js date, it's hard for me to consider both utc and js. So when i want to pass a 'YYYY-MM-DD' formatted date to my datepicker, i first convert it to 'MM/DD/YYYY' format using moment.js or whatever you like, and the date shows on datepicker is now correct. For your example
var d = new Date('2011-09-24'); // d will be 'Fri Sep 23 2011 20:00:00 GMT-0400 (EDT)' for my lacale
var d1 = new Date('09/24/2011'); // d1 will be 'Sat Sep 24 2011 00:00:00 GMT-0400 (EDT)' for my lacale
Apparently d1 is what i want. Hope this would be helpful for some people.

You can convert this date to UTC date by
new Date(Date.UTC(Year, Month, Day, Hour, Minute, Second))
And it is always recommended to use UTC (universal time zone) date instead of Date with local time, as by default dates are stored in Database with UTC. So, it is good practice to use and interpret dates in UTC format throughout entire project.
For example,
Date.getUTCYear(), getUTCMonth(), getUTCDay(), getUTCHours()
So, using UTC dates solves all the problem related to timezone issues.

This through me for a loop, +1 on zzzBov's answer. Here is a full conversion of a date that worked for me using the UTC methods:
//myMeeting.MeetingDate = '2015-01-30T00:00:00'
var myDate = new Date(myMeeting.MeetingDate);
//convert to JavaScript date format
//returns date of 'Thu Jan 29 2015 19:00:00 GMT-0500 (Eastern Standard Time)' <-- One Day Off!
myDate = new Date(myDate.getUTCFullYear(), myDate.getUTCMonth(), myDate.getUTCDate());
//returns date of 'Fri Jan 30 2015 00:00:00 GMT-0500 (Eastern Standard Time)' <-- Correct Date!

It means 2011-09-24 00:00:00 GMT, and since you're at GMT -4, it will be 20:00 the previous day.
Personally, I get 2011-09-24 02:00:00, because I'm living at GMT +2.

Though in the OP's case the timezone is EDT, there's not guarantee the user executing your script will be int he EDT timezone, so hardcoding the offset won't necessarily work. The solution I found splits the date string and uses the separate values in the Date constructor.
var dateString = "2011-09-24";
var dateParts = dateString.split("-");
var date = new Date(dateParts[0], dateParts[1] - 1, dateParts[2]);
Note that you have to account for another piece of JS weirdness: the month is zero-based.

I encountered this exact problem where my client was on Atlantic Standard Time. The date value the client retrieved was "2018-11-23" and when the code passed it into new Date("2018-11-23") the output for the client was for the previous day. I created a utility function as shown in the snippet that normalized the date, giving the client the expected date.
date.setMinutes(date.getMinutes() + date.getTimezoneOffset());
var normalizeDate = function(date) {
date.setMinutes(date.getMinutes() + date.getTimezoneOffset());
return date;
};
var date = new Date("2018-11-23");
document.getElementById("default").textContent = date;
document.getElementById("normalized").textContent = normalizeDate(date);
<h2>Calling new Date("2018-11-23")</h2>
<div>
<label><b>Default</b> : </label>
<span id="default"></span>
</div>
<hr>
<div>
<label><b>Normalized</b> : </label>
<span id="normalized"></span>
</div>

My solution to parse an ISO date without beeing annoyed by the timezone is to add a "T12:00:00" at the end before parsing it, because when it's noon at Greenwich, well the whole world is on the same day :
function toDate(isoDateString) {
// isoDateString is a string like "yyyy-MM-dd"
return new Date(`${isoDateString}T12:00:00`);
}
Before:
> new Date("2020-10-06")
> Date Mon Oct 05 2020 14:00:00 GMT-1000 (heure normale d’Hawaii - Aléoutiennes)
After:
> toDate("2020-10-06")
> Date Tue Oct 06 2020 12:00:00 GMT-1000 (heure normale d’Hawaii - Aléoutiennes)

if you're just looking to make sure the individual parts of the date stay the same for display purposes, *this appears to work, even when I change my timezone:
var doo = new Date("2011-09-24 00:00:00")
just add the zeros in there.
In my code I do this:
let dateForDisplayToUser =
new Date( `${YYYYMMDDdateStringSeparatedByHyphensFromAPI} 00:00:00` )
.toLocaleDateString(
'en-GB',
{ day: 'numeric', month: 'short', year: 'numeric' }
)
And I switch around my timezone on my computer and the date stays the same as the yyyy-mm-dd date string I get from the API.
But am I missing something/is this a bad idea ?
*at least in chrome. This Doesn't work in Safari ! as of this writing

As most answers are hacky, allow me to propose my very simple hack that worked for me: Set the script's timezone to UTC
process.env.TZ = 'UTC' // this has to be run before any use of dates
With this change, any timezone modifications are neutralized, so as long as you don't need the runner's actual timezone, this is probably the easiest fix.

// When the time zone offset is absent, date-only formats such as '2011-09-24'
// are interpreted as UTC time, however the date object will display the date
// relative to your machine's local time zone, thus producing a one-day-off output.
const date = new Date('2011-09-24');
console.log(date); // Fri Sep 23 2011 17:00:00 GMT-0700 (PDT)
console.log(date.toLocaleDateString('en-US')); // "9/23/2011"
// To ensure the date object displays consistently with your input, simply set
// the timeZone parameter to 'UTC' in your options argument.
console.log(date.toLocaleDateString('en-US', { timeZone: 'UTC' })); // "9/24/2011"

The best way to handle this without using more conversion methods,
var mydate='2016,3,3';
var utcDate = Date.parse(mydate);
console.log(" You're getting back are 20. 20h + 4h = 24h :: "+utcDate);
Now just add GMT in your date or you can append it.
var mydateNew='2016,3,3'+ 'GMT';
var utcDateNew = Date.parse(mydateNew);
console.log("the right time that you want:"+utcDateNew)
Live: https://jsfiddle.net/gajender/2kop9vrk/1/

I faced some issue like this. But my issue was the off set while getting date from database.
this is stroed in the database and it is in the UTC format.
2019-03-29 19:00:00.0000000 +00:00
So when i get from database and check date it is adding offset with it and send back to javascript.
It is adding +05:00 because this is my server timezone. My client is on different time zone +07:00.
2019-03-28T19:00:00+05:00 // this is what i get in javascript.
So here is my solution what i do with this issue.
var dates = price.deliveryDate.split(/-|T|:/);
var expDate = new Date(dates[0], dates[1] - 1, dates[2], dates[3], dates[4]);
var expirationDate = new Date(expDate);
So when date come from the server and have server offset so i split date and remove server offset and then convert to date. It resolves my issue.

Trying to add my 2 cents to this thread (elaborating on #paul-wintz answer).
Seems to me that when Date constructor receives a string that matches first part of ISO 8601 format (date part) it does a precise date conversion in UTC time zone with 0 time. When that date is converted to local time a date shift may occur
if midnight UTC is an earlier date in local time zone.
new Date('2020-05-07')
Wed May 06 2020 20:00:00 GMT-0400 (Eastern Daylight Time)
If the date string is in any other "looser" format (uses "/" or date/month is not padded with zero) it creates the date in local time zone, thus no date shifting issue.
new Date('2020/05/07')
Thu May 07 2020 00:00:00 GMT-0400 (Eastern Daylight Time)
new Date('2020-5-07')
Thu May 07 2020 00:00:00 GMT-0400 (Eastern Daylight Time)
new Date('2020-5-7')
Thu May 07 2020 00:00:00 GMT-0400 (Eastern Daylight Time)
new Date('2020-05-7')
Thu May 07 2020 00:00:00 GMT-0400 (Eastern Daylight Time)
So then one quick fix, as mentioned above, is to replace "-" with "/" in your ISO formatted Date only string.
new Date('2020-05-07'.replace('-','/'))
Thu May 07 2020 00:00:00 GMT-0400 (Eastern Daylight Time)

This solved my problem (thanks to #Sebastiao answer)
var date = new Date();
//"Thu Jun 10 2021 18:46:00 GMT+0200 (Eastern European Standard Time)"
date.toString().split(/\+|-/)[0] ; // .split(/\+|-/) is a regex for matching + or -
//"Thu Jun 10 2021 18:46:00 GMT"
var date_string_as_Y_M_D = (new Date(date)).toISOString().split('T')[0];
//2021-06-10

I just wanted to give my 2 cents on this, as this post was very helpful to figure out the issue. I don't think I've seen this solution mentioned, correct me if I'm wrong.
As it has been mentioned numerous times already here, the problem comes mainly from summer/winter time. I noticed that in January, the GMT was +1. If the time is not set, it will always be 00.00.00 (midnight), which results in going on the 23rd hour of the previous day.
If you have a dynamic date and don't care about the hour, you can set the hour using the setHours() method before using it with toISOString().
syntax:
setHours(hoursValue, minutesValue, secondsValue, msValue)
Which means that:
dynamicDate.setHours(12, 0, 0, 0)
dynamicDate.toISOString()
should hopefully work for you as even if the date is one hour ahead/behind it will still be the same day now that we're setting the hour to be noon.
More about setHours() on MDN.

You can use moment library to format the date.
https://momentjs.com/
let format1 = "YYYY-MM-DD"
let date = new Date();
console.log(moment(date).format(format1))
EDIT
The moment is now deprecated, you can use date-fns format method for formatting a date.
import { format } from 'date-fns'
format(new Date(), "yyyy-MM-dd")

You are using the ISO date string format which, according to this page, causes the date to be constructed using the UTC timezone:
Note: parsing of date strings with the Date constructor (and
Date.parse, they are equivalent) is strongly discouraged due to
browser differences and inconsistencies. Support for RFC 2822 format
strings is by convention only. Support for ISO 8601 formats differs in
that date-only strings (e.g. "1970-01-01") are treated as UTC, not
local.
If you format the text differently, such as "Jan 01 1970", then (at least on my machine) it uses your local timezone.

Storing yyyy-mm-dd in MySql Date format you must do the following:
const newDate = new Date( yourDate.getTime() + Math.abs(yourDate.getTimezoneOffset()*60000) );
console.log(newDate.toJSON().slice(0, 10)); // yyyy-mm-dd

Following Code worked for me. First I converted to date and time string to localeDateString then apply the split function on the returned string.
const dateString = "Thu Dec 29 2022 00:00:00 GMT+0500 (Pakistan Standard Time)";
const date = new Date(dateString).toLocaleDateString().split("/");
const year = new Date(dateString).getFullYear();
const month = new Date(dateString).getMonth();
console.log(new Date(`${date[2]}-${date[0]}-${date[1]}`));
// 2022-12-29T00:00:00.000Z
// Due to timezone issue, the date is one day off.
console.log(new Date("2011-09-24"));
// => 2011-09-24T00:00:00.000Z-CORRECT DATE.
console.log(new Date("2011/09/24"));
// => 2011-09-23T19:00:00.000Z -ONE DAY OFF AS BEFORE.

Using moment you can keep Offset while converting toISOString
let date = moment("2022-03-15").toISOString();
// WRONG OUTPUT 2022-03-14T18:30:00.000Z
let date = moment("2022-03-15").toISOString(true);
// CORRECT OUTPUT 2022-03-15T00:00:00.000+05:30

The following worked for me -
var doo = new Date("2011-09-24").format("m/d/yyyy");

When I try to create a date object from another date format, the result date is changing it's value

When I try to create a date object from another date format, the result date is changing it's value. How to achieve this without changing the date value ?
new Date("Mon, 31 Oct 2016 00:00:00 GMT");
the result coming as Sun Oct 30 2016 20:00:00 GMT-0400 (Eastern Daylight Time), How can I get the Monday 31 date from the above?

Adjusting the timezoneOffset from the created date object should do the trick,
but be cautious while using it , as you should be sure that the date object was created from GMT not from some local time .
And the below answer has been posted assuming the input date was in GMT
var tempDate = new Date("Mon, 31 Oct 2016 00:00:00 GMT");
var tempTime = tempDate.getTime() + (tempDate.getTimezoneOffset() * 60000);
tempDate = new Date(tempTime);
console.log(tempDate);

It doesn't change the date, it just converts it to your local timezone. This is a bit of annoying behaviour and the only way I know to get around it is to set your system timezone to GMT. If you need to do date and time work, you might want to look at Moment.js - http://momentjs.com/

javascript timestamp doesn't works in FireFox and in IE [duplicate]

I have an existing date time string in place
new Date('2014-08-01T00:00:00')
But instead of returning 2014-08-01, it returns as 2014-07-31 in the actually angularJS view.
I wonder is this date time string valid, if not, why its not valid.
Could the T be the reason that the string return a wrong date?
The console.log return a date of Thu Jul 31 2014 20:00:00 GMT-0400 (EDT)
Thank You
Lets call those -2 are toxic vote downs. They should really recall the days when they are struggling to understand the basic concepts that now apparant to them. Its a shame.

At present (Autumn 2014), JavaScript's date/time format diverges from ISO-8601 in a very important way: If there's no timezone indicator on the string, it assumes Z ("Zulu", GMT).
So
new Date('2014-08-01T00:00:00')
...is August 1st at midnight GMT. If you live east of GMT, that will be on the 31st in your local time.
However, this incompatibility with ISO-8601 is being fixed in ES6 and some implementations (including the latest V8 in Chrome) are already updating it. The ES6 spec changes the default to local time; check out §20.3.1.15 ("Date Time String Format", the section number may change) in the draft PDFs or this unofficial HTML version.

The displayed date uses the timezone of your browser/computer. This means that if you are in GMT-1 and you enter 2014-08-01T00:00:00, the actual date is 2014-08-01T00:00:00 - 1 hour = 2014-07-31T23:00:00

I have this date in startdate=2021-10-27T00:00:00-04:00,
d=new Date(data.StartDate) // outputTue Oct 26 2021 23:00:00 GMT-0500
But date is getting one day before'Tue Oct 26 2021 23:00:00 GMT-0500' in central timezone(below -6,-7,-8...).
Actually I used this it is working fine but for central timezone not working
var d = new Date(data.StartDate);
console.log(data.startDate);
$scope.txtStartDate = ("0" + (d.getMonth() + 1)).slice(-2) + "/" + ("0" + d.getDate()).slice(-2) + "/" + d.getFullYear();

AngularJS wrong unix time parse result

I have a timestamp 1378028575 that gives me Sun, 01 Sep 2013 09:42:55 GMT here. But when I try to format it with Angular date, it returns it as Jan 17, 1970 2:47:08 AM, using this format: {{'1378028575' | date:'medium'}}. The result from the site is correct but in Angular is wrong. Why does it happen, or what am I doing wrong?

Its cause you use seconds not milliseconds.
new Date(1378028575)
Fri Jan 16 1970 23:47:08 GMT+0100 (CET)
new Date(1378028575000)
Sun Sep 01 2013 11:42:55 GMT+0200 (CEST)
from the angular docs:
Date to format either as Date object, milliseconds (string or number)
or various ISO 8601 datetime string formats (e.g.
yyyy-MM-ddTHH:mm:ss.SSSZ and its shorter versions like
yyyy-MM-ddTHH:mmZ, yyyy-MM-dd or yyyyMMddTHHmmssZ). If no timezone is
specified in the string input, the time is considered to be in the
local timezone.

The other answer isnt quite complete. Since your timestamp is in seconds, not miliseconds, in Angular.js you can do this:
{{1378028575 * 1000 | date:'medium'}}
Knowing seconds * 1000 = miliseconds is one thing. Knowing you can put math in the date expression is another :)

Javascript date formatting - one hour out due to daylight saving

So now, its 9:23am. I have a UTC date string that represents the current date, that looks like this "2012-07-17T09:23:27.75"
I want that in a date object, so I can display a nicely formatted date, so I:
var myDate = new Date("2012-07-17T09:23:27.75")
// Gives --> Tue Jul 17 2012 10:23:27 GMT+0100 (GMT Daylight Time)
So because of daylight saving time I'm getting an hour-out issue. I can see that myDate.getTimezoneOffset() gives me -60, what's the standard / best practice way to get my date to actually reflect the current correct time? Have I just entered javascript date hell?

Try momentjs.com. I really found it handy for such things.
var myDate = moment("2012-07-17T09:23:27.75");
Gives you a date instance in your timezone (that basically configured on your computer). Moreover momentjs has nice human friendly formattings like "a couple of seconds ago", "a month ago",...
Dates are really a hell in JS (but not only in JS). The best thing you can do is to always only transport in UTC between browser <-> server. Then on the server convert it to what time format you like, you obviously only have to be consistent. That way I managed to handle date-times properly.

Try removing the 'T'
I was debugging some date time format issue in chrome when I found out that in console
new Date('2016-04-16T15:15:00') returns Sat Apr 16 2016 16:15:00 GMT+0100 (GMT Daylight Time)
while
new Date('2016-04-16 15:15:00') returns Sat Apr 16 2016 15:15:00 GMT+0100 (GMT Daylight Time)