date-io

Why it's ranked here

The project solves a concrete interoperability problem for component authors who must support several date ecosystems. Its broad contract, locale-aware formatting, timezone support, and alternative-calendar packages make it more substantial than a thin conversion wrapper.

What's good

The contract covers practical picker needs: validation, comparisons, date arithmetic, week and month grids, localized input formats, meridiem labels, and date-time merging. Adapters use optional peer dependencies, so users only bundle the date library they select.

Tradeoffs

Behavior is not perfectly uniform across adapters. Localized output varies by locale and underlying library, and Luxon cannot provide format helper text. Library authors must install, version-lock, and re-export every adapter they promise to support.

How to use it well

Use it when building reusable date or time controls that should respect each consumer's chosen date library and native value type. Register one adapter through application context or dependency injection. It supplies date operations, not the visual controls themselves.

Observed

License

MIT

Primary language

TypeScript

Interface

JavaScript and TypeScript library packages distributed through npm

Packaging

Private workspace root with packages under packages/*

Adapters documented

date-fns, Moment, Luxon, Day.js, js-joda, date-fns-jalali, Jalaali, and Hijri

Build outputs

Shared Rollup configuration produces ESM and CommonJS modules targeting ES6

Type surface

Generic date and locale contract with parsing, formatting, comparison, arithmetic, and calendar helpers