Develop Reference

Change timezone format

after chaning my date timezone using toLocalString()
new Date(dateParam).toLocaleString('en-US', { timeZone: "Australia/Sydney" })
i've got this string 5/25/2022, 8:44:46 PM, how can i transform from this format to default new Date() fromat Tue Jul 05 2022 23:22:37 GMT+0300, to be able to use Date methods(example: toDateString(), getFullYear())?

add to your solution two parameters dataStyle and timeStyle like in the example below
console.log(new Intl.DateTimeFormat('en-GB', { dateStyle: 'full', timeStyle: 'long' }).format(date));
// Expected output "Sunday, 20 December 2020 at 14:23:16 GMT+11"

Convert JS date format into localized human readable format

How should I convert a date format of YYYY-MM-DD into a human readable format %e %B %Y in JS by taking into an account a different language from system's locale?
In PHP it would be like
<?php echo trim(strftime('%e %B %Y', strtotime('2019-07-31'))); ?>
// Renders: 31 July 2019
I want to have the same, but with a corresponding language locale, for example "French format" so it will become : 31 Juillet 2019
==== UPDATED ====
As mention by #Baljinder Singh, solution below from the link, works perfectly
console.log(
new Date('2019-07-31').toLocaleDateString('fr-FR', {
year: 'numeric',
month: 'long',
day: 'numeric'
})
)

If it's browser-specific then you can make it dynamic with window.navigator.language.
const date = new Date('2019-07-31').toLocaleDateString(window.navigator.language, {
year: 'numeric',
month: 'long',
day: 'numeric',
});
console.log(date);
Notice: Working fine in chrome and firefox.

Try
let d = new Date('2019-08-20');
let s = d.toLocaleDateString(navigator.languages,{day:"numeric", month:"long", year: "numeric"});
console.log(s);

Javascript Date is not formatting correctly using `toLocaleString`

I am trying to format date in 'MM/dd/yyyy' (short date format) using toLocaleString function of javascript Date. But it is not giving expected result when I change my timezone. Bellow is snippet of my code
var d1 = new Date(1954, 0, 1); // Fri Jan 01 1954 00:00:00 GMT-0900 (AKST)
var options = {
year: 'numeric',
month: '2-digit',
day: '2-digit'
};
var shortDate = d1.toLocaleString('en-US', options);
console.log(shortDate);
Above code prints 12/31/1953 instead of expected result which is 01/01/1954.
Observations/Steps:
Change timezone of local machine to Whitehorse - Canada(Pacific DayLight Time).
Run above code snippet to replicate result.
It only gets reproduced for year value less than 1968 (works fine for years greater than 1968)
For reference, uploaded recording for it (http://recordit.co/cdWMgWFLKJ)

local date time function is a conversion from UTC to locale date time. You need to change UTC time first.
so use this.
var d1 = new Date(Date.UTC(1954, 0, 1)); // Fri Jan 01 1954 00:00:00 GMT-0900 (AKST)
var options = {
year: 'numeric',
month: '2-digit',
day: '2-digit'
};
var shortDate = d1.toLocaleString('en-US', options);
console.log(shortDate);

JavaScript full names for day-of-week and month (or How to get the date names per client locale)

The string that is returned from (new Date()).toString() looks something like this:
"Tue Nov 22 2016 14:14:51 GMT-0800 (Pacific Standard Time)"
Is there a built-in method/constructor that we can use that will not abbreviate the day-of-week and/or month? In other words, does JS support this:
"Tuesday November 22 2016 14:14:51 GMT-0800 (Pacific Standard Time)"
The reason for my question is because I'm looking for a lazy/hacky way that we might be able to get the Weekday and Month names in the language of the client.

If you don't need to support old browsers (older than IE 11), you can use toLocalDateString().
Example:
new Date().toLocaleDateString('en-US', {
weekday: 'long',
month: 'long',
day: 'numeric',
year: 'numeric',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
timeZoneName: 'short'
})
But moment.js is way more comfortable.
See MDN Date.prototype.toLocaleDateString() for more information.

As Josa's answer implies, it is possible to get the full names for the weekday and month (for most modern browsers).
I used the .toLocaleDateString() to extract the full names of the weekday and month in the language of the client successfully using Chrome and IE11 (it does NOT work in Safari 9).
Extending the idea of getting the full names from the browser, I was curious if we could, then, get the name of the weekday and the name of the month in the language that matches the client's locale. The following experiment shows that that it is possible (although, not reliable).
For Experiment/Fun:
The following function will return an object that includes the name of the Weekday and Month for a particular date in the language of a particular locale-code.
Fiddle
function getWeekdayAndMonthNamesByLocaleCode(localeCode, date) {
var Names = {
Weekday: "",
Month: ""
};
if (!(date instanceof Date && !isNaN(date.valueOf()))) {
date = new Date();
}
if (localeCode == null || localeCode.length < 2) {
localeCode = navigator.language;
}
Names.Month = date.toLocaleDateString(localeCode, {
month: 'long',
});
Names.Weekday = date.toLocaleDateString(localeCode, {
weekday: 'long'
});
return Names;
}
I haven't tested the function for browser compatibility and I certainly wouldn't rely on it to work for all languages, but I thought it was interesting enough to post here for others to experiment with.

How to format date without time using toLocaleTimeString

I have a Date, which I want to convert to a string, but without the time, just the date part.
My current code:
var date = new Date(2014, 9, 08); //Wed Oct 08 2014 00:00:00 GMT-0500 (Central Daylight Time)
var options = {weekday: "long", year: "numeric", month: "long", day: "numeric"};
console.log(date.toLocaleTimeString("en-US", options));
// output: Wednesday, October 8, 2014 12:00:00 AM
// what I'm looking for: Wednesday, October 8, 2014
How can I modify the options to not display time?

Juste use toLocaleDateString instead of toLocaleTimeString and you should get the result you are expecting :
var date = new Date('2014', '9', '08'); //Wed Oct 08 2014 00:00:00 GMT-0500 (Central Daylight Time)
var options = {weekday: "long", year: "numeric", month: "long", day: "numeric"};
console.log(date.toLocaleDateString("en-US", options));
returns : "Wednesday, October 8, 2014"
I will also second the above poster and recommend using moment.js; it is lightweight and very flexible.

If you are satisfied with allowing the browser to determine the display format, you can use the toDateString or toLocaleDateString functions of the Date object. You will get different results on different browsers.
Otherwise, consider using a library such as moment.js, so you can control the format to your liking. For example:
moment([2014,9,8]).format('dddd, MMMM Do, YYYY') // "Wednesday, October 8, 2014"