Date- fns format date string

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Date- fns format date string

Although this tutorial has content that we believe is of great benefit to our community, we haven't tested or edited it yet to ensure you have a error-free learning experience. It's on our list, and we're working on it. You can help us by using the Report a problem button at the bottom of this tutorial. Working

with dates in JavaScript is not easy. Therefore, if you look at package.json files for most applications, you will usually find a directory like Moment.js. Moment.js one of the first libraries to gain notoriety. This has made analysis/formatting/calculation dates less daunting for developers. But do you know

about a library called date-fns? date-fns are usually considered to be a worthy alternative to Moment.js. Not only because it has the same function, but it also appeals to functional programmers. You can install date-fns on npm/yarn: # Use npm $npm install date-fns # Or yarn $ yarn add date-fns

Formatting dates to bread and butter in libraries like Moment.js/date-fns. This is because native JavaScript is not an easy way to handle this. date-fns uses string patterns similar to Moment.js: const format = require(date-fns/format ); const stPattysDay = new date(03/17/2020); const formattedDate1 =

format(stPattysDay, 'MM/dd/yyyy'); const formattedDate2 = format(stPattysDay, 'MMMM dd, yyyy'); console.log(formattedDate1); => 03/17/2020 console.log(formattedDate2); => March 17, 2020 It's that simple! There are several ways to format dates to look exactly the way you want them to look.

Now that we can format dates, what about performing addition/subtraction with them? This has several functions: addDays subDays addWeeks subWeeks addMonths subMonths in the following example we add 1 year to a specified date: const format = require('date-fns/format'); const addYears =

require(date-fns/addYears); const stPattysDay = new date(03/17/2020); const stPattysDayNextYear = addYears(stPattysDay, 1); const formattedDate = format(stPattysDayNextYear, 'MMMM dd, yyyy'); console.log(formattedDate); => March 17, 2021 Regional formatting is simple enough, but what

about locales? We know that users from all over the world visit your site, and we don't want to assume that they speak our native language. To do this, you can import special regional plug-ins: constant format = require(date-fns/format); const russianLocale = require(date-fns/locale/ru); const stPattysDay =

new date(03/17/2020); const formattedDate = format(stPattysDay, 'MMMM dd, yyyy', { locale: russianLocale }); console.log(formattedDate); => 17, 2020 The ability to calculate differences between 2 dates is important for a date manipulation directory number. date-fns provides a number of

functions for calculating this. For example, you can calculate january 1st to Christmas (as well as working days!): constant format = require('date-fns/format'); Const = require(date-fns/addYears); konstans k?l?nbs?gInDays = = constant differenceIn BusinessDays = require(date-fns/differenceIn

BusinessDays) const startDate = new Date('01/01/2020'); const endDate = new date(24/12/2020); const daysBetween = differenceInDays(endDate, startDate); const workdaysBetween = differenceIn BusinessDays(endDate, startDate); console.log(daysBetween); => 358 consoles.log(between working

days); => 256 One of the biggest drawbacks .js moment is that it is great! There is no way to import individual functions because the API only allows chaining. This means that you must import the entire directory: constant moment = require('moment'); const formattedDate = moment(new

Date()).format(MM/DD/YYYY); console.log(formattedDate); => 03/17/2020 The date-fns with just grab the specific features you need (similar to Lodash): const format = require(date-fns/format). const formattedDate = format(new Date(), MM/dd/yyyy); console.log(formattedDate); => 03/17/2020 This

is much less addictive to datefns than Moment.js. See figure below for package size Moment.js vs date-fns: Source: BundlePhobia Note that there is a way to configure webpack to exclude locale plugins. This would significantly reduce the size of the package. Conclusion date-fns seems to be getting a lot

more development work than moment.js at the moment . Because of this, it's really well maintained and developers get more input in the direction. With a robust set of functions and modern ES6 sensitivity, it's worth trying!

The official docs for date-fns are really great and have lots of code

patterns! Machining dates in JavaScript is painful. Native date methods are often verbose and sometimes inconsistent - which also makes them error-bent. But the good news is in our hands. There are many libraries that have the pain of outdated manipulation. These directories are JavaScript dates, we

jQuery the native DOM API. Let me give you an example. This accepted answer is a stack overflow question that asks how to make the last day of the month: var t = new Date(); alert( new Date(t.getFullYear(), t.getMonth() + 1, 0, 23, 59, 59) ); Of course that works, but it's not immediately clear what the

numbers are after getMonth represents. Now unlike that, it is significantly more readable: const ma = new Date(); console.log( lastDayOfMonth(today) ); This lastDayOfMonth method is one provided by date-fns, a self-proclaimed comprehensive toolkit for manipulating JavaScript dates in the browser and

node.js. In this article I will show you how to get up and run on date-fns. After reading you will be able to drop into your projects and take advantage of the many assistive methods to manipulate dates with ease. This makes the code like t.getMonth() + 1, 0, 23, 59, 59 a thing of the past. So, why not just

use Moment.js? Moment.js a fantastic library working on dates in JavaScript - it has many great features and offers a whole host of Utilities. However, this is not without its critics. Many refer to the fact that Moment objects are volatile (i.e. operations such as adding or subtracting to change the original

Moment object) as confusing for developers and source of error. It has also come under fire for its large size. Moment doesn't play well with modern tree shaking algorithms and if you need internationalization or time zone support, you can quickly find yourself in a fairly large JavaScript package. This has

gone so far as to point out that Chrome developer tools now highlight that using Moment can lead to poor performance. If JavaScript libraries prove costly, replace them with smaller alternatives. Lighthouse @ChromeDevTools now recommends smaller libraries that improve the package size.

pic.VFe8TFV9Y5 - Addy Osmani (@addyosmani) September 12, 2020 All of which have prompted moment maintainers to put the project into maintenance mode and discourage Moment from being used for new projects going forward. We understand that many existing projects can still use

Moment, but we want to discourage Moment from being used in new projects. Instead, we would like to offer alternatives that are excellent choices for use in modern applications. This makes date-fns one of the best alternatives .js out there. Installation Since the second version of the directory, the only

way to install date-fns is to install the npm package. npm install date-fns Or via Yarn: yarn add date-fns You can use date-fns with both commonjs modulation system and ES modules: const { lastDayOfMonth } = require('date-fns'); or: import { lastDayOfMonth } from date-fns file; Unfortunately there is

currently no CDN version of date-fns available. The removal and possible restore is being discussed with the GitHub issue. But that doesn't mean you can't use it in your browser, just that you need to introduce a bundled linking step to your workflow. Let's look at how to do that now. I assume node and

npm are installed on your computer. If not, please read the tutorial on installing Node. Then install Parcel.Next, install Parcel. It is a bundler (similar to Webpack) that allows you to bundle up javascript and serve it in your browser. npm install -g parcel-bundler Next, make a new project a package.json file.

mkdir datefns cd datefns npm init -y Install the date-fns directory as above: npm install date-fns Note: it creates a date-fns folder in a node_modules folder in the project directory. If you look at the date-fns folder, you'll see a lot more folders and files. Don't worry, we're not going to deliver much to the

client. We select only the necessary functions, and then we run everything through the plot to make a minified and wood shaken bundle. Now create two files, index.html and index.js. <! Doctype lang=en><head><meta charset=UTF-8><title>d?tum-

fns</title></head><body><script src=index.js></script></body></html> src=index.js></script></body></html> import { lastDayOfMonth } from date-fns file; const today = new date(); console.log(lastDayOfMonth(today)); Start the parcel's built-in development

server: package .html and locate the . Nothing appears on the page, but when you open your browser console. you should that it has swamped the last day of the current month. When deploying, you can run mail order index.js --experimental-scope-hoist to parcel output in a minified and wood-shaken

batch in the dist folder. Now that it's working, let's see what the dates can do. One of the most common tasks when working with dates is the ability to shape them nicely. We can do this in date-fns format. Change the HTML from our example page above. to look like this: <body><h1>Today's date

<span></span></h1><script src=index.js></script></body> The index.js you want to import the format function, which is then transferred to today's date and format string. Then we want to release the result to the page. import { format } from date-fns; const today = new date();

const formattedDate = format(ma, 'dd.MM.yyyy'); document.querySelector('h1 > span').textContent = formattedDate; Of course, we are not just in dd.MM.yyyy format, let's try something else: const formattedDate = format (today, PPPP); It formats the output as such: Wednesday, September 16, 2020.

For a complete list of formatting options, see your documents. Change locale If you have a site in multiple languages, date-fns makes it easier to internationalized times and dates. Welcome to Germany: <h1>Heute ist <span></span></h1> And in JavaScript you can import german

locales and pass them to the format function: import { format } from date-fns; import { de } from date-fns/locale; const today = new date(); const formattedDate = format(ma, 'PPPP', { locale: de }); document.querySelector('h1 > span').textContent = formattedDate; This output is something along: Heute ist

Mittwoch, 16. September 2020. It may seem complicated to require and transfer locales, but Moment.js which inflates the build by default with all locales, d?tumfns forces developers to manually request locales as and when they are needed. For a list of available locales, node_modules the project's

website/date-fns/locale folder. Immutability, Purity and Simplicity Is one of the selling points for date-fns that features clean, and simple, explain. This leads to easy-to-understand code, which is easier to debug when things go wrong. Let me present this moment as a .js example. As mentioned above,

Moment dates are volatile, which can lead to unexpected behavior. const moment = require(moment); const now = new date(); Const = moment(now); mNow.add(day, 3); console.log(mNow.toDate()); mNow.add(3, 'day'); console.log(mNow.toDate()); I have a few pairs to take note here. Moment's add

feature is not hustle and bustle in the order in which you accept the arguments (although the first method now throws in the deprecation warning). But even more disturbing is that if you invite him several times in a row, you will not get the same result because Moment objects are volatile: mNow.add(3,

'day'); mNow.add(3, 'day'); Now compare that date-fns, which keeps arguments in one order and always returns the same result, returns a new date object for each call. import { addDays } from date-fns file; const today = new date(); const threeDaysTime = addDays(3, today); const sixDaysTime =

addDays(threeDaysTime, 3); console.log(today); console.log(threeDaysTime); console.log(sixDaysTime); Also notice how the method name is more expressive (add more instead of just add), keeping things consistent and having a method to do one thing and one thing only. If you look at the list of posts

on SitePoint's JavaScript channel, you'll see that some are listed as published on a certain day, while others are listed as published x days ago. It might take a while if you tried to implement this vanilla in JavaScript, but the date-fns is this wind - just use the formatDistance method. Let's compare two

different dates. import { formatDistance } from date-fns; const startDate = new date(2020, 8, 16); const endDate = new date(2020, 11, 25); const distanceInWords = formatDistance(startDate, endDate); console.log('It's ${distanceInWords} until Christmas); Note that when working with JavaScript, months

are zero-based (e.g. 11 . It understands me over and over again. Date-fns have some very useful assistive methods that you can use to manipulate collections of dates in all sorts of ways. The following example compareAsc sorts dates in ascending order. Returns 1 if the first date is after the second date,

-1 if the first date is before the second date, or 0 if the dates are equal. import { compareAsc } from date-fns; constant date1 = new date(2005-01-01); constant date2 = new date(2010-01-01); const date3 = new date(2015-01-01); const arr = [date3, date1, date2]; const sortedDates = arr.sort(compareAsc);

As you can see, the dates are now in ascending order. The asc comparison is compareDesc. import { compareDesc } from date-fns; ... const sortedDates = arr.sort(compareDesc); To create days between two dates, you can use the addDays method you previously viewed, as well as eachDayOfInterval

helper, which returns an array of dates within the specified range. import { addDays, eachDayOfInterval } from date-fns; const today = new date(); const aWeekFromNow = addDays (today, 7); const thisWeek = eachDayOfInterval( { start: today, end: aWeekFromNow }, ); console.log (this week); To find the

nearest date in a specific date array, use the nearestto method. This snippet follows from the previous example: { addDays, addDays, nearest } from date-fns; ... const Christmas = new date(2020, 11, 25); const closestToChristmasDate = closestTo(christmas, thisWeek); console.log(closestToChristmasDate); There's also the nearestIndexTo method if you want the index to be the array instead. The ultimate helper I would like to look at isvalid method, which, as the name suggests, checks if a specific date is valid. However, because of the way JavaScript deals with dates, there are a few gotchas to be aware of: import { isValid } for date-fns; const invalidDate = new date(2020, 02, 30); console.log(isValid(invalidDate)); You'll be forgiven if you think that the above snippet of code should be fake, since by 31 December 2020, you'll be able to see the same thing. To understand what is happening, enter the new date(2020, 02, 30') on your browser console. You will see Sun Mar 01 2020 come back to you ? JavaScript took the extra day from late February and turned out to be on March 1 (which is of course a valid date). By working around this, we can analyze the date before verifying its validity: import { isValid, analysis } the date-fns; const validDate = parse('29.02.2020', 'dd.MM.yyyy', new Date()); const invalidDate = parse('30.02.2020', 'dd.MM.yyyy', new Date()); console.log(validDate); console.log(invalidDate); console.log(isValid(validDate)); console.log(isValid(invalidDate)); This is easy to extract from a small assistive method, useful, such as checking user input on forms. Time zones One of the drawbacks of date-fns is that it does not currently have a time zone helper feature like Moment.js, but rather returns the local time zone on which the code runs. This Stack Overflow response gives some background to native date objects that don't actually store real-time zone data. In this topic you will notice that mention the method of setting time zones native javaScript. This is not a comprehensive solution, but it works for many scenarios that require only output conversion (from UTC or local time to a specific time zone). new Date().toLocaleString(en-US, {timeZone: America/New_York}); Time zones are actually a complicated problem to solve, which is why MomentJS has a separate directory as well. There are plans on foot to add time zone support to date-fns, but at the time of writing, it's still a work in progress. However, there is a package available at npm (based on an unmerged pull request date-fns) that adds time zone support to date-fns v2.0.0 using the Intl API. The 140k weekly downloads seem popular, but at the time of writing, it was not updated for several months. That said, here's how to use: npm i date-fns-tz import { format, utcToZonedTime } a date-fns-tz; const today = new date(); const timeZone = Australia/Brisbane; const timeInBrisbane = utcToZonedTime(today, timeZone); console.log(' Munich time: ${format(today, 'yyyy-MM-dd Hh:mm:ss')} Brisbane time: ${format(timeInBrisbane, 'yyyy-MM-dd `); Conclusion Date-fns is a great little library that brings a lot of helpful methods for working with dates and times in JavaScript with finger tips. During this active development, and now that moment.js has been put into maintenance mode, it makes a great replacement moment.js. I hope this article has given you enough understanding and inspiration to go check it out and start using it for your own projects. Projects.

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