webringactive
fdu
An ultra-fast, zero-dependency date-time library for JavaScript. It runs about 4 times faster than Day.js.
TypeScript / npm / Zero-Dependency· 2025
view .mdopen in claudeopen in chatgpt
An ultra-fast, zero-dependency date-time library for JavaScript and TypeScript. It has an immutable API, a tree-shakeable ESM design, and locale-aware formatting. Its arithmetic follows calendar-correct floor semantics, meaning it rounds date math down to whole units instead of up.
Performance
fdu was benchmarked against Day.js, date-fns, and Luxon. The results:
- fdu runs 4 times faster at date manipulation.
- fdu runs 13 times faster at comparisons.
- fdu runs 1.7 times faster at formatting.
Usage
import { fdu } from "@pyyupsk/fdu";
const date = fdu("2025-09-30");
date.format("YYYY-MM-DD HH:mm:ss");
date.add(1, "day").format("[Tomorrow is] dddd");