Comparing
Modern JavaScript date utility library
End-to-end browser testing framework that runs tests in Chromium, Firefox, and WebKit.
| Metric | date-fns | @playwright/test |
|---|---|---|
| Ecosystem | npm | npm |
| Difficulty | Intermediate | Intermediate |
| Weekly downloads | 71.4M↑ | 5.2M |
| Latest version | v4.1.0 | v1.47.2 |
| Recipes | 2 | 3↑ |
date-fns only
Shared
@playwright/test only
Use date-fns for formatting, parsing, arithmetic (add/subtract days, months, years), comparison, and locale-aware output in any JavaScript environment. Import only what you need and the bundle impact is minimal.
Critical user flows (login, checkout, onboarding), cross-browser compatibility checks, visual regression testing, scraping JS-rendered content, accessibility audits.
date-fns v2 has limited first-party timezone support — for complex timezone-aware applications use Luxon or the Temporal polyfill. The function-heavy API can feel verbose for simple one-liners; Day.js's method chaining is more readable in those cases.
Unit or integration testing (Vitest/Jest is faster). Tests that don't need a real browser. Simple API testing (use supertest or fetch).
date-fns
@playwright/test