Comparing
Modern JavaScript date utility library
End-to-end type-safe APIs — share TypeScript types between server and client without code generation.
| Metric | date-fns | @trpc/server |
|---|---|---|
| Ecosystem | npm | npm |
| Difficulty | Intermediate ✓ | Advanced |
| Weekly downloads | 71.4M↑ | 1.2M |
| Latest version | v4.1.0 | v11.0.0 |
| Recipes | 2 | 2 |
date-fns only
Shared
@trpc/server 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.
Full-stack TypeScript monorepos, Next.js apps where frontend and backend share a codebase, projects where you want type safety without REST/GraphQL ceremony.
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.
Public APIs consumed by third parties (use REST or GraphQL). Polyglot teams where some consumers aren't TypeScript. Microservices with many separate repos.
date-fns
@trpc/server