javascript-time-ago
Advanced tools
The `javascript-time-ago` npm package is used to format dates and times in a human-readable way, such as '5 minutes ago' or '2 days ago'. It supports multiple languages and locales, making it a versatile tool for internationalization.
Basic Usage
This feature allows you to format a date into a human-readable string indicating the time elapsed since that date. The example shows how to set up the package for English and format a date to '1 minute ago'.
const TimeAgo = require('javascript-time-ago');
const en = require('javascript-time-ago/locale/en');
TimeAgo.addLocale(en);
const timeAgo = new TimeAgo('en-US');
console.log(timeAgo.format(new Date(Date.now() - 60 * 1000))); // '1 minute ago'Custom Styles
This feature allows you to define custom styles for formatting the elapsed time. The example demonstrates how to create a custom style and use it to format a date.
const TimeAgo = require('javascript-time-ago');
const en = require('javascript-time-ago/locale/en');
TimeAgo.addLocale(en);
const timeAgo = new TimeAgo('en-US');
const customStyle = {
steps: [
{ formatAs: 'second' },
{ formatAs: 'minute' },
{ formatAs: 'hour' },
{ formatAs: 'day' },
{ formatAs: 'week' },
{ formatAs: 'month' },
{ formatAs: 'year' }
]
};
console.log(timeAgo.format(new Date(Date.now() - 60 * 1000), customStyle)); // '1 minute ago'Localization
This feature supports multiple languages and locales, allowing you to format dates in different languages. The example shows how to set up the package for both English and Spanish.
const TimeAgo = require('javascript-time-ago');
const en = require('javascript-time-ago/locale/en');
const es = require('javascript-time-ago/locale/es');
TimeAgo.addLocale(en);
TimeAgo.addLocale(es);
const timeAgoEn = new TimeAgo('en-US');
const timeAgoEs = new TimeAgo('es-ES');
console.log(timeAgoEn.format(new Date(Date.now() - 60 * 1000))); // '1 minute ago'
console.log(timeAgoEs.format(new Date(Date.now() - 60 * 1000))); // 'hace 1 minuto'Moment.js is a widely-used library for parsing, validating, manipulating, and formatting dates. It offers extensive functionality for date and time manipulation, but it is larger in size compared to `javascript-time-ago` and has been deprecated in favor of more modern solutions.
date-fns provides a comprehensive set of functions for working with dates in JavaScript. It is modular, allowing you to import only the functions you need, which can result in smaller bundle sizes. It also supports internationalization, similar to `javascript-time-ago`.
timeago.js is a small library used to format dates in a 'time ago' style. It is lightweight and easy to use, but it may not offer as many customization options or support for as many locales as `javascript-time-ago`.
International higly customizable relative date/time formatter (both for past and future dates).
Formats a date/timestamp to:
For React users there's also a React component.
This is a readme for version 2.x. See version 1.x readme. See a migration guide from version 1.x to version 2.x.
npm install javascript-time-ago --save
import TimeAgo from 'javascript-time-ago'
// Load locale-specific relative date/time formatting rules.
import en from 'javascript-time-ago/locale/en'
// Add locale-specific relative date/time formatting rules.
TimeAgo.addLocale(en)
// Create relative date/time formatter.
const timeAgo = new TimeAgo('en-US')
timeAgo.format(new Date())
// "just now"
timeAgo.format(Date.now() - 60 * 1000)
// "a minute ago"
timeAgo.format(Date.now() - 2 * 60 * 60 * 1000)
// "2 hours ago"
timeAgo.format(Date.now() - 24 * 60 * 60 * 1000)
// "a day ago"
Russian
import TimeAgo from 'javascript-time-ago'
// Load locale-specific relative date/time formatting rules.
import en from 'javascript-time-ago/locale/en'
import ru from 'javascript-time-ago/locale/ru'
// Add locale-specific relative date/time formatting rules.
TimeAgo.addLocale(en)
TimeAgo.addLocale(ru)
// cyka blyat
const timeAgo = new TimeAgo('ru-RU')
timeAgo.format(new Date())
// "только что"
timeAgo.format(Date.now() - 60 * 1000)
// "1 минуту назад"
timeAgo.format(Date.now() - 2 * 60 * 60 * 1000)
// "2 часа назад"
timeAgo.format(Date.now() - 24 * 60 * 60 * 1000)
// "1 день назад"
Mimics Twitter style of time ago ("1m", "2h", "Mar 3", "Apr 4, 2012")
timeAgo.format(new Date(), 'twitter')
// ""
timeAgo.format(Date.now() - 60 * 1000, 'twitter')
// "1m"
timeAgo.format(Date.now() - 2 * 60 * 60 * 1000, 'twitter')
// "2h"
timeAgo.format(Date.now() - 2 * 24 * 60 * 60 * 1000, 'twitter')
// "Mar 3"
timeAgo.format(Date.now() - 365 * 24 * 60 * 60 * 1000, 'twitter')
// "Mar 5, 2017"
Twitter style uses Intl for formatting day/month/year labels. If Intl is not available then it falls back to the default style.
timeAgo.format(Date.now() - 60 * 1000, 'time')
// "1 minute"
Similar to the default style but with "ago" omitted:
No locale data is loaded by default: a developer must manually choose which locales must be loaded. This is to reduce the resulting javascript bundle size.
If the resulting bundle size is of no concern (for example, when building a big enterprise application), or if the code is being run on server side (Node.js), then one can use this helper to load all available locales:
require('javascript-time-ago/load-all-locales')
The above sections explained all the basics required for using this library in a project.
This part of the documentation contains some advanced topics for those willing to have a better understanding of how this library works internally.
This library comes with three "styles" built-in: the default one, "twitter" style and "time" style. Each of these styles is an object defining its own flavour and gradation. If none of them suits a project then a custom "style" object may be passed as a second parameter to .format(date, style) having the following shape:
flavour – Preferred labels variant. Is "long" by default. Can be either a string (e.g. "short") or an array of preferred flavours in which case each one of them is tried until a match is found. E.g. ["tiny", "short"] searches for tiny first and falls back to short. short, long and narrow are always present for each locale.
gradation – Time interval measurement units scale. Is convenient by default. Another one available is canonical. A developer may supply a custom gradation which must be an array of steps each of them having either a unit : string or a format(value, locale) : string function. See Twitter style for such an advanced example.
units – A list of time interval measurement units which can be used in the output. E.g. ["second", "minute", "hour", ...]. By default all available units are used. This is only used to filter out some of the non-conventional time units like "quarter" which is present in CLDR data.
Relative date/time labels come in various "flavours": long, short, narrow are the standard CLDR ones (always present) possibly accompanied by other ones like tiny which is defined for en, ru and ko. Refer to locale/en for an example.
import english from 'javascript-time-ago/locale/en'
english.tiny // '1s', '2m', '3h', '4d', …
english.narrow // '1 sec. ago', '2 min. ago', …
english.short // '1 sec. ago', '2 min. ago', …
english.long // '1 second ago', '2 minutes ago', …
tiny is supposed to be the shortest one possible. It's not a CLDR-defined one and has been defined for en, ru and ko so far.narrow is a CLDR-defined one and is supposed to be shorter than short, or at least no longer than it. I find narrow a weird one because for some locales it's the same as short and for other locales it's a really weird one (e.g. for Russian).short is "short".long is "regular".A gradation is a list of time interval measurement steps.
[
{
unit: 'second',
},
{
unit: 'minute',
factor: 60,
threshold: 59.5
},
{
unit: 'hour',
factor: 60 * 60,
threshold: 59.5 * 60
},
…
]
Each step is described by:
unit — a localized time measurement unit: second, minute, hour, day, month, year are the standardized CLDR ones.factor — a divider for the supplied time interval (in seconds).threshold — a minimum time interval value (in seconds) required for this gradation step. Each step must have a threshold defined except for the first one. Can a number or a function(now: number, future: boolean) returning a number. Some advanced threshold customization is possible like threshold_for_[prev-unit] (see ./source/gradation/convenient.js).granularity — for example, 5 for minute to allow only 5-minute intervals: 0 minutes, 5 minutes, 10 minutes, etc.If a gradation step should output not simply a time interval of a certain time unit but something different instead then it may be described by:
threshold — same as above.format — a function(value, locale) returning a string. value argument is the date/time being formatted as passed to TimeAgo.format(value): either a number or a Date. locale argument is the selected locale (aka "BCP 47 language tag", e.g. ru-RU). For example, the built-in Twitter gradation has regular minute and hour steps followed by a custom one formatting a date as "day/month/year", e.g. Jan 24, 2018.For more gradation examples see source/gradation folder.
Built-in gradations:
import {
canonical, // '1 second ago', '2 minutes ago', …
convenient // 'just now', '5 minutes ago', …
} from 'javascript-time-ago/gradation'
When given future dates .format() produces the corresponding output, e.g. "in 5 minutes", "in a year", etc.
The default locale is en and can be changed: TimeAgo.setDefaultLocale('ru').
This library is based on Intl.RelativeTimeFormat.
There is also a React component built upon this library which autorefreshes itself.
(this is an "advanced" section)
Intl global object is not required for this library, but, for example, if you choose to use the built-in twitter style then it will fall back to the default style if Intl is not available.
Intl is present in all modern web browsers and is absent from some of the old ones: Internet Explorer 10, Safari 9 and iOS Safari 9.x (which can be solved using Intl polyfill).
Node.js starting from 0.12 has Intl built-in, but only includes English locale data by default. If your app needs to support more locales than English on server side (e.g. Server-Side Rendering) then you'll need to use Intl polyfill.
An example of applying Intl polyfill:
npm install intl@1.2.4 --save
Node.js
import IntlPolyfill from 'intl'
const locales = ['en', 'ru', ...]
if (typeof Intl === 'object') {
if (!Intl.DateTimeFormat || Intl.DateTimeFormat.supportedLocalesOf(locales).length !== locales.length) {
Intl.DateTimeFormat = IntlPolyfill.DateTimeFormat
}
} else {
global.Intl = IntlPolyfill
}
Web browser: only download intl package if the web browser doesn't support it, and only download the required locale.
async function initIntl() {
if (typeof Intl === 'object') {
return
}
await Promise.all([
import('intl'),
import('intl/locale-data/jsonp/en'),
import('intl/locale-data/jsonp/ru'),
...
])
}
initIntl().then(...)
After cloning this repo, ensure dependencies are installed by running:
npm install
This module is written in ES6 and uses Babel for ES5 transpilation. Widely consumable JavaScript can be produced by running:
npm run build
Once npm run build has run, you may import or require() directly from
node.
After developing, the full test suite can be evaluated by running:
npm test
When you're ready to test your new functionality on a real project, you can run
npm pack
It will build, test and then create a .tgz archive which you can then install in your project folder
npm install [module name with version].tar.gz
FAQs
Localized relative date/time formatting
We found that javascript-time-ago demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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