Comparing
Modern JavaScript date utility library
Primitive and flexible state management for React based on atomic state units.
| Metric | date-fns | jotai |
|---|---|---|
| Ecosystem | npm | npm |
| Difficulty | Intermediate | Beginner ✓ |
| Weekly downloads | 71.4M↑ | 900K |
| Latest version | v4.1.0 | v2.9.3 |
| Recipes | 2 | 2 |
date-fns only
Shared
jotai 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.
React apps needing shared state without prop drilling, derived/computed state that updates automatically, fine-grained re-render control, per-route or per-feature isolated state.
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.
Non-React environments (Jotai is React-only). Complex state machines (use XState). Apps already committed to Redux with large middleware ecosystems.
date-fns
jotai