Moment js format date time

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Moment js format date time

moment(String, String); moment (string, string, string); moment(String, String, String[]); moment (String, String, Boolean); moment (String, String, String, Boolean); If you know the format of an input string, you can use it to analyze for a moment. (12-25-1995, MM-DD-YYYY) By default, the parser ignores non-alphanumeric characters, so both of the following return the same. (12-25-1995, MM-DD-YYYY) torque(12/25/1995, MM-DD-YYYY) You may get unexpected results when analyzing both date and time. The following example cannot be analyzed as you expect: torque('24/12/2019 09:15:00', DD MM YYY hh:mm:ss); You can use string mode that identifies the interpretation error and sets the Moment object as invalid: torque('24/12/2019 09:15:00', DD MM YYY Hh:mm:ss, true); Parsing tokens correspond to the formatting tokens used in moment# format. Tokens are upper and lower case for year, month, and day. Input example Description YYYY 2014 4 or 2 digit years. Note: Only 4 digits can be parsed on strict mode YY 14 2 digit years Y -25 Years by any number of digits and sign Q 1..4 Quarter of the year. Sets month to first month of the quarter. M MM 1..12 Month number MMM MMMM Jan. December Month name in countries set by moment.locale () D DD 1..31 Day of month Do 1st.. 31st month of order DDD DDDD 1..365 Anniversary X 1410715640.579 Unix timestamp x 1410715640579 Unix ms timestamp YYYY from version 2.10.5 supports 2-digit years, and converts them to one year near 2000 (same as YY). Y was added in 2.11.1. It will match any number, signed or unsigned. It is useful for years that are not 4 digits or are before the common era. It can be used for any year. Weekly numbers and week tokens For these, the small tokens use the start days of the country-ready date that are ready for the week, and the large tokens use the start days of the ISO week date. Case sensitive. Input example Description gggg 2014 Locale 4 digit weekly year gg 14 Locale 2 digit week year w ww 1..53 Locale week of the year e 0..6 Locale day in week ddd dddd Man ... Sunday Day name in locale set by moment.locale () GGGG 2014 ISO 4 digit weekyear GG 14 ISO 2-digit weekyear W WW 1..53 ISO week in year E 1..7 ISO day of the week Local aware formats Locale aware date and time formats are also available using LTS L LL LLL LLLL. They were added in version 2.2.1, except LTS, which was added 2.8.4. Case sensitive. Input example Description L 09/04/1986 Date (in local format) LL September 4 1986 Month name, day of month, year LLL September 4 1986 8:30 Month name, day of month, year, time LLLL Thursday, September 4 1986 8:30 a.m. Weekday, month name, day in month, year, time LT 8:30 Time (without seconds) LTS 8:30:00 Time (by seconds) Hour, minute, second, milliseconds, and offset tokens Tokens are upper and lowercase letters. Input sample description H HH 0..23 Hours (24 hours time) hh hours (12 hours time spent with an A.) k 1..24 Hours (24 hours time from 1 to 24) a Am Post or ante meridiem (Note characters a p is also considered valid) m mm 0..59 Minutes ss 0..59 Seconds S S S S SSS ... SSSSSSSS 0..999999999 000 Tr. SECOND Z ZZ +12:00 Offset from UTC as +-HH:mm, +-HHmm or Z From version 2.10.5: fractions of second length 4 up to 9 can parse any number of digits, but will only take into account the top 3 (milliseconds). Use if the time is printed with many fractional digits and will consume the input. Note that the specified number of S characters is only relevant for parsing in strict mode. In default mode, S, SS, SSS, SSSS are all equivalent and are interpreted as fractions of a second. For example, 0.12 is always 120 milliseconds, passing SS will not cause it to be interpreted as 12 milliseconds. Z ZZ was added in version 1.2.0. SS SSS was added in version 1.6.0. X was added in version 2.0.0. SSSSS ... SSSSSSSSS was added in version 2.10.5. k kk was added in version 2.13.0. Unless you specify a time zone offset, if you interpret a string, a date is created in the current time zone. torque(2010-10-20 4:30, YYYY-MM-DD HH:mm) parsed as 4:30 local time moment(2010-10-20 4:30 +0000, ?YYY-MM-DD HH:mm Z); parsed as 4:30 UTC tokens there are uppercase and lowercase letters. Input Examples Description y .. yyyy 5 +5 -500 Years yo 5th Ordinal Years N AD Abbr Era name NN AD Abbr Era name NNN AD Abbr Era name NNNN Anno Domini Full Era name NNNNNN AD Narrow Era name Era support was added in 2.25.0. The Tokens/API is still in motion. Notes and gotchas If the moment due to the interpreted input does not exist, moment #isValid will return false. (2010 13, YYYY MM).isValid() false (not a real month) moment(2010 11 31, YYY MM DD). fake (not a real day) moment(2010 2 29, YYYY MM DD).isValid(); false (not a leap year) moment(2010 notamonth 29, YYYY MMM DD).isValid(); false (not a real month name) From version 2.0.0, a country setup can be transferred as the third parameter for moment() and moment.utc(). ('2012 juillet', 'YYYY MMM', 'fr') moment('2012 July', 'YYYY MMM', 'en') moment('2012 July', 'YYYY MMM', ['qj', 'en']) Moment's parser is very forgiving and this can lead to unwanted/unexpected behavior. For example, the following behavior can be used to use the following behavior: This has been corrected. ('I am spartacus', 'h:hh A').isValid(); true - 'am' matches the 'A' flag. From version 2.3.0 you can specify a Boolean for the last argument to make Moment use string parsing. Strict interpretation requires that the format and input correspond exactly, including delimeters. ('It is 2012-05-25', 'YYYY-MM-DD').isValid(); true moment('It's 2012-05-25', 'YYYY-MM-DD', true).isValid(); false moment('2012-05-25', 'YYY-MM-DD', true).isValid(); true moment('2012.05.25', 'YYYY-MM-DD', true).isValid() false You can use both country and string. torque('2012-10-14' 'fr', true); Strict parsing is often the best interpretation option. For more information about choosing string vs-forgiving parsing, see the interpretation guide. Parsing double-digit years By default, double-digit years above 68 are assumed to be in the 1900s, and years 68 or less are assumed to be in the 2000s. This can be changed by replacing the moment.parseTwoDigitYear method. The only argument in this method is a string that contains the user's two years of input and must return the year as integer. moment.parseTwoDigitYear = function(yearStren) { returnparseInt(yearString) + 2000; } Parsing glued hour and minutes From version 2.11.0 parsing hmm, Hmm, hmmss and Hmmss supported: torque(123, hmm).format(HH:mm) ===01:23 torque(1234, hmm).format(HH:mm) ===12:34 Working with dates and times in JavaScript has always been a little cumbersome. Baseline date methods are detailed, and the API is often inconsistent. Therefore, you often hear the Use Moment .js if you ask a date-related question about StackOverflow. What is Moment.js? Moment.js is a Swiss army knife for working with dates in JavaScript. It allows you to analyze, validate, manipulate and display dates and times using a clean and accurate API. In this article I will show you how to get up and running with Moment.js, as well as demonstrate several of its common use cases. Warning for new users: Use date-fns Instead Note that from September 2020, we recommend that users who want to implement a date library use date-fns instead. The .js is a fairly heavy library for its function, and Chrome development tools now actively recommend not to use it as part of core web vitals performance testing. As a result, the project is in maintenance mode and new function development is no longer on the table according to Moment.js maintainers. Learn date-fns: A lightweight JavaScript Date Library Getting started with The Moment.js Moment.js is freely available for download from the project's website. Moment.js can be run from the browser as well as from inside a Node application. To use it with Node, install the module using the following command. npm install moment Then simply require () and use it in your program as shown below. const moment = require('moment') const today = moment(); console.log(today.format()) To run Moment.js from the browser, it includes using a <script> tag, as shown below. Moment.js creates a global moment object which can be used to access all the date and time parsing and manipulation

functionality. <! DOCTYPE html> <html lang=en> <head> <meta charset=UTF-8> <title>Moment.js</title> </head> <body> <script src= amp;gt;</script> <script> const today =(moment) console.log(today.format()); </script> In the past, I remember to convert date strings into Date objects, individual pieces of data, and then perform string links. Moment.js Moment.js simplified the process of date conversion to a specific format. Converting the date format with Moment is simple, as shown in the following example. ().format('YYY-MM-DD') Call moment() gives us the current date and time, while the format() converts it to the specified format. In this example, a date is formatted as a four-digit year, followed by a hyphen followed by a two-digit month, another hyphen, and a double-digit day. See The Pen's day formatting with torque.js by SitePoint (@SitePoint) on the CodePen. Tip: Try experimenting with some of the other date formats specified in the project documentation. Another annoying task, moment.js has greatly simplified is date validation. To perform validation, simply transfer a date string to the moment object, along with the date format you want, and call the isValid(). This is returned to true if the date is valid, and false otherwise. console.log(moment(2020-01-01, YYYY-MM-DD).isValid()) console.log(time(not-a-date, YYYY-MM-DD).isValid()) However, be aware that Moment allows you to work with partial dates, which can lead to unexpected results. console.log(moment(2019 was a good year because I got married, YYYY-MM-DD). To avoid this, you can put Moment in strict parsing mode by passing it true as a third argument. console.log(moment(2019 was a good year because I got married, YYYY-MM-DD, true).isValid() ); Here's an example to showcase this functionality. See the date nozzle date for .js moment after SitePoint (@SitePoint) on the CodePen. There are a number of other useful flags in the object that are returned by torque(): overflow ? This is set when an overflow occurs. An example could be the 13th invalidMonth ? Set when the month is invalid, for example, empty ? Enter when the entered date does not contain any parable. nullInput ? Specify when the specified date is null. You can read more about these and other available flags on the project's website. There are a number of options for manipulating the currently object. add or subtract days, months, years, etc. This is achieved using add() and subtract() methods. The following example shows how seven days, months, or weeks are added to today's date. torque().add(7, 'days') torque().add(7, 'months') torque().add(7, 'years') Similarly, the subtrist() method is shown below. (().dragging(7, 'days') torque()dragging(7, 'months') torque().dragging(7, 'years') Note that each of the above examples returns the moment object. If you want a human-readable date, you must format it accordingly. const today = moment(); const nextWeek = today.add(7, 'days'); console.log(nextWeek.format('dddd Do MMMM, YYYY')); Time from now Another common task is to determine how much time there is between two dates. To calculate time from today's date, Moment.js uses a method named fromNow(). To check how long it's been since torque('2020.01.01', 'YYY. MM.DD').fromNow(); If we pass in the truth as an argument, we can get the value without the ending. torque('2020.01.01', 'YYY. MM.DD').fromNow(true); The FromNow() method is used to compare time with today's date. This is just a special case of from() comparing two arbitrary dates. An example that uses from() is shown below. const dateA = moment('01-01-1900', 'DD-MM-YYYY') const dateB = torque('01-01-2000', 'DD-MM-YYYY') console.log(dateA.fra(dateB)) You may have played with this method in the following demo. View the pen time from another moment date.js by SitePoint (@SitePoint) on the CodePen. Moment.js a way to calculate the difference between two dates. The difference is calculated by default in milliseconds, but can also be returned in days, months, years, and so on. To calculate the difference, call the diff() method. This method takes a date as its first argument. The time unit can be set using the optional second argument. If this is not included, milliseconds are used. The following example and demo illustrate how diff() is used. const dateB = moment('2014-11-11') const dateC = moment('2014-10-11') console.log('Difference is', dateB.diff(dateC), 'milliseconds') console.log('Difference is', dateB.diff(dateC, 'days'), 'days') console.log('The difference is', dateB.diff(dateC, 'months'), 'months') See the pen Calculate the difference between dates with moment.js afterPoint Site (@SitePoint) on the CodePen. Moment.js also provides different date comparison methods. These methods include isBefore(), isAfter() and isSame(), which, as the names suggest, returns a Boolean indication of whether a date is before, after, or equal to another date. An example that uses isAfter() is shown below. console.log(moment('2020-01-01').isAfter('2019-01-01');); console.log(moment('2020-01-01').isAfter('2020-01-08');); There is also an isLeapYear() method that checks for leap years. console.log(moment([2020]).isLeapYear()); console.log(moment([2019]).isLeapYear()); International Language Support Moment.js offers great i18n support. This allows you to assign a global language or set the language of a specific moment object. By default, it supports the English language. To support another language, assign the key values for that language to moment.locale. The following abbreviated example, taken from torque.js docs, shows how support can be added for French. const moment = require('moment') moment.locale('fr', { months : 'janvier_f?vrier_mars_avril_mai_juin_juillet_ao?t_septembre_octobre_novembre_d?cembre'('_'), weekdays : 'dimanche_lundi_mardi_mercredi_jeudi_vendredi_samedi'.split('_'), relativeTime : {future : 'dans %s', past : 'il y a %s' s : 'quelques secondes', m : 'une minute', etc.: '%d minutes', h : 'une heure', hh : '%d heures', d : 'un jour', dd : '%d jours', M : 'un mois', MM : '%d mois', y: 'un an', yy : '%d as' } } } } } moment.locale('fr') console.log(moment().format('dddd Do MMMM, YYYY')) See Pen Internationalization with Moment.js of SitePoint (@SitePoint) on codepen. Why Moment might not be a good fit Although Moment.js is an excellent time and date library, it's also something of a behemoth. For example, if you use it with webpack, just an innocent requires ('moment'); is enough to ensure that all locations join the tour. This increases your bundle size and you need to resort to plugins to get it down again. It also comes with a variety of features, but unlike libraries like Lodash, it doesn't allow you to cherry-pick the ones you need. Instead, always load the entire library. Another common complaint is that the moment object is changeable. This can lead to confusion among developers. Consider: const moment = requires ('moment'); const today = moment(); const nextWeek = today.add(7, 'days'); console.log (today.fromNow()); What would you expect to be logged on to the console? Unfortunately, the answer is for 7 days (and not a few seconds ago) because the code today.add(7, 'days') mutated the moment object, setting it to seven days in the future. This can be avoided by cloning the moment object before preforming any date math, but by the time you remember to do so, chances are you've already spent quite a bit of time debugging. const moment = require('moment') const today = moment(); const nextWeek = today.clone().add(7, 'days'); console.log (today.fromNow()); A Lightweight Alternative For those of you looking for an easier alternative, consider date-giggles. Date-fns are immutable, always return a new date instead of changing the one you pass in. It has a simple API, is the perfect companion for Webpack and with its feature-per-file style you can choose just what you need. If you'd like to know more, read: Getting started with date-fns ? a Lightweight JavaScript Date Library Conclusion Moment.js really is an awesome library that simplifies date and time-related manipulations and validations. In this article, we focused on some of the features of Moment.js which helps analyze, validate, and manipulate dates and times in the browser and Node.js applications. A number of useful plugins are also available for Moment.js. Plugins like ISO Calendar, Jalaali Calendar, and many more can be found on the official plugin page. For more on Moment.js, the reader is directed to the library's documentation. Documentation.

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