The **date‑math** library provides a lightweight, functional‑style toolkit for performing immutable date arithmetic and unit‑level getters/setters—similar to Moment.js but without chaining—making it ideal for developers who need reliable, chain‑free date manipulation in JavaScript/TypeScript projects. It’s especially useful for anyone building date‑centric logic (e.g., scheduling, reporting, or validation) who wants a small, chain‑free alternative to heavier date libraries.