Mastering JavaScript Dates and Times – Fundamentals to Advanced Techniques
freeCodeCamp.org
Jul 1, 2026
Handling dates in JavaScript is notoriously error-prone due to time zone complexity and leap year quirks. This masterclass demonstrates how to abandon legacy date-handling habits in favor of native UTC storage, the powerful Intl API for localization, and robust strategies that avoid expensive third-party libraries.
Key insight: JavaScript’s built-in Intl API handles complex date/time localization, currency, and relative time formatting natively, making heavy third-party libraries like Moment.js unnecessary for most modern applications.
