date-fns

date-fns
Name	date-fns
Platform	JavaScript
Language	JavaScript

date-fns date-fns is a JavaScript library that provides functions for manipulating, parsing, formatting, and calculating dates. It is used in web development, server-side applications, and libraries that depend on date operations, with comparisons to other tooling in ecosystems such as React (web framework), Node.js, Angular (web framework), Vue.js, and Deno (software). The project interacts with standards and environments influenced by Ecma International, WHATWG, W3C, ISO 8601 standard, Unicode Consortium, and implementations across platforms like Linux, Windows, macOS, and cloud providers such as Amazon Web Services, Google Cloud Platform, Microsoft Azure.

Overview

date-fns is positioned among JavaScript date libraries alongside Moment.js, Luxon, Day.js, js-joda, and Temporal (proposal). It emphasizes functional programming patterns used by projects influenced by Lodash, Underscore.js, Ramda (programming) and practices promoted in communities around Functional Programming advocates such as John Hughes, Simon Peyton Jones, Guy L. Steele Jr.. The library is distributed via npm and engages with package management tools like Yarn and pnpm. Contributors collaborate through platforms such as GitHub and discuss issues in channels similar to Stack Overflow and Reddit (website). date-fns aligns with internationalization efforts encouraged by ECMA-402, Unicode Common Locale Data Repository, and localization stacks tied to CLDR and standards referenced by organizations like International Organization for Standardization.

Features and Modules

date-fns exposes many discrete functions comparable to modules in Node.js core and patterns used by Moment.js and Luxon. It includes localization support reflecting locales similar to work by Unicode Consortium and region lists referencing entities like United States, United Kingdom, Germany, France, Japan, China, India, Brazil, Canada, Australia, Russia, Spain, Italy, Mexico, Netherlands, Sweden, Norway, Denmark, Finland, Poland, Czech Republic, Portugal, Greece, Turkey, South Korea, Argentina, Chile, Colombia, South Africa, Egypt, Israel, Saudi Arabia, United Arab Emirates, Singapore, Hong Kong, New Zealand, Ireland, Belgium, Switzerland, Austria, Hungary, Romania, Bulgaria, Slovakia, Slovenia, Croatia, Serbia, Ukraine, Belarus, Lithuania, Latvia, Estonia, Iceland, Luxembourg, Monaco, Liechtenstein, San Marino, Vatican City, Andorra, Malta, Cyprus, Maldives, Sri Lanka, Pakistan, Bangladesh, Nepal, Bhutan, Myanmar, Thailand, Vietnam, Philippines, Indonesia, Malaysia to accommodate global date formats. Functional modules include operations for parsing inspired by patterns in ISO 8601 standard, formatting influenced by Unicode Consortium guidelines, arithmetic analogous to POSIX (operating system), and comparison utilities similar to methods found in Java Standard Library date classes. The modular approach mirrors strategies from Webpack, Rollup (software), and esbuild to enable tree-shaking in bundlers used by developers working with Create React App, Next.js, and Nuxt.js.

Usage and Examples

Developers integrate date-fns into stacks that include React (web framework), Angular (web framework), Vue.js, Svelte, Ember.js, and server runtimes like Node.js and Deno (software). Common patterns reflect examples from documentation models similar to MDN Web Docs and tutorials on platforms like freeCodeCamp, Codecademy, Coursera, Udemy, and Pluralsight. Example idioms often parallel operations in languages and libraries such as JavaScript, TypeScript, Python (programming language), Ruby (programming language), Java (programming language), and C# when mapping formatting tokens derived from ICU MessageFormat conventions. Code snippets are shared in developer communities on GitHub, discussed in issues on Stack Overflow, and demonstrated in conference talks at events like JSConf, React Conf, NodeConf, Velocity Conference, and Frontend Conference.

Performance and Compatibility

Performance considerations place date-fns in comparisons with Moment.js, Day.js, Luxon, and the Temporal (proposal) for speed, bundle size, and memory usage. Its function-per-file design supports optimization workflows used in projects built with Webpack, Rollup (software), Parcel (software), and esbuild, and conforms to module formats recognized by ECMAScript (standard), CommonJS, and UMD (file format). Compatibility matrices often reference environments like Node.js, Bun (software), Deno (software), browsers maintained by vendors such as Google Chrome, Mozilla Firefox, Safari (web browser), Microsoft Edge, and platforms with WebViews like Android (operating system), iOS. Benchmarks are run on infrastructure from Amazon Web Services, Google Cloud Platform, and Microsoft Azure and compared using tools like Lighthouse (software), WebPageTest, and continuous integration services such as Jenkins, Travis CI, GitHub Actions, and CircleCI.

Development and Versioning

date-fns development practices mirror workflows common on GitHub with pull requests, continuous integration, and semantic versioning inspired by Semantic Versioning guidelines. Release management often aligns with changelog standards referenced by projects like Angular (web framework), React (web framework), Vue.js and follows contribution models seen in large open-source organizations such as Apache Software Foundation, Linux Foundation, Mozilla Foundation, Eclipse Foundation, and corporate stewardship patterns from Google, Microsoft, Meta Platforms, Amazon (company). Tooling in the repository borrows from ecosystems including Babel (software), ESLint, Prettier, TypeScript, Jest (software testing), Mocha (software), and packaging with npm (software), with release artifacts distributed to registries like npm (software).

Adoption and Ecosystem

date-fns is adopted by projects in companies like Facebook, Google, Microsoft, Netflix, Uber, Airbnb, Twitter, LinkedIn, Shopify, Spotify, GitHub, Atlassian, Salesforce, Red Hat, Adobe Inc., IBM, Oracle Corporation, Pinterest, Dropbox, Slack Technologies, Trello, Stripe, Square (company), eBay, PayPal, WhatsApp, Telegram (software), Zoom Video Communications, Discord (software), Snap Inc., Pinterest (company), ByteDance, Alibaba Group, Tencent and many open-source projects. The ecosystem includes integrations and plugins for frameworks and tools like Next.js, Gatsby (web framework), Nuxt.js, Create React App, Ionic (software), Electron (software), React Native, Expo (software), Capacitor (software), and UI libraries such as Material-UI, Ant Design, Bootstrap (front-end framework), Semantic UI, Chakra UI. Community resources appear on sites like Stack Overflow, Reddit (website), Hacker News, Medium (website), Dev.to, and in conference presentations at JSConf, React Conf, NodeConf.

Category:JavaScript libraries