date-fns
date-fns is a modern JavaScript library for manipulating dates and times, providing a comprehensive set of functions for parsing, formatting, comparing, and calculating dates. It offers a modular, functional API that is lightweight, tree-shakeable, and immutable by design, making it a popular alternative to older date libraries like Moment.js.
Developers should use date-fns when working with date and time operations in JavaScript applications, especially in modern frontend frameworks like React, Vue, or Angular, or in Node.js backends. It is ideal for tasks such as formatting dates for display, calculating time differences, handling time zones, and performing date arithmetic, as it provides a clean, functional approach with minimal bundle size impact.