Momentjs
Moment.js is a JavaScript library that provides utilities for parsing, validating, manipulating, and displaying dates and times in JavaScript applications. It is widely used in both web browsers and Node.js environments and offers a simple, chainable API for common date-time operations. Moment.js objects are mutable by default, meaning methods commonly modify the original moment instance, though a clone method is available to work with copies. The project was created by Tim Wood and has been distributed under the MIT license.
Key features include parsing and validating date strings from various formats (including ISO 8601 and RFC 2822),
Maintenance status and alternatives: In 2020, the Moment.js team announced that Moment.js is a legacy project
Usage example: moment().format('YYYY-MM-DD') demonstrates typical formatting, while moment('2024-01-01').add(7, 'days') shows arithmetic on dates.