Mastering JavaScript Dates and Times – Fundamentals to Advanced Techniques

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Learn about the complexities of JavaScript date and time handling with this comprehensive guide. Whether you're working with time zones, formatting dates for different locales, or preparing your code for production, this resource covers it all, including the upcoming Temporal API advancements.



📚Resources

- Source Code: https://github.com/tapascript/40-days-of-javascript/tree/main/day-41

- MDN INTL(DateTimeFormat): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat

- intl-date-utils package: https://github.com/CreoWis/intl-date-utils

- Courses on tapaScript YouTube Channel: https://youtube.com/tapasadhikary

- React Clean Code Rulebook: https://www.tapascript.io/books/react-clean-code-rule-book

- Join my FREE Course, 40 Days of JavaScript: https://www.youtube.com/playlist?list=PLIJrr73KDmRw2Fwwjt6cPC_tk5vcSICCu

- Join my FREE Course, 15 days of React Design patterns: https://www.youtube.com/playlist?list=PLIJrr73KDmRyQVT__uFZvaVfWPdfyMFHC



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⭐️ Chapters

- 0:00:00 The BIG Problem with JavaScript Dates

- 0:03:35 Why is Time Handling So Hard?

- 0:04:35 The Core Struggle for Developers

- 0:06:38 What is Epoch Time? (The Starting Point)

- 0:09:58 Timestamp vs. TimeZone: Don't Confuse Them!

- 0:11:35 Understanding UTC (The Global Standard)

- 0:13:15 Best Practices: Storing vs. Rendering Dates

- 0:16:22 GMT and Local Time Explained Simply

- 0:19:23 Setting Up Our Coding Environment

- 0:20:04 4 Ways to Create Dates in JavaScript

- 0:30:14 Must-Know Date Getter Methods & Tricks

- 0:36:46 Mastering Date Setters & Logic Rules

- 0:40:52 WATCH OUT: Common JS Date Gotchas!

- 0:44:22 How to Parse & Validate Dates Properly

- 0:46:21 Date Arithmetic: Adding & Subtracting Time

- 0:50:56 The Leap Year Logic You Need to Know

- 0:54:57 Handling Daylight Saving Time (DST) Like a Pro

- 0:59:58 RECAP of PART 1: Key Takeaways for Mastery

- 1:01:56 Intro: Why JavaScript Intl APIs are Underrated

- 1:04:26 The Problem: Why Global Date & Time Formats are Hard

- 1:05:56 Getting Started with Intl.DateTimeFormat()

- 1:10:22 Mastering Locales for Global Date Formatting

- 1:16:05 Formatting Guide: Styling Dates & Times in JS

- 1:21:55 Real-World Examples: Practical Date-Time Formatting

- 1:28:57 Pro Tip: How to Programmatically Get Timezone Names

- 1:31:24 Relative Time Formatting (e.g., "2 days ago")

- 1:34:45 Advanced UI: Using formatToParts() for Custom Layouts

- 1:37:53 Logic Deep Dive: How JavaScript Resolves a Locale

- 1:41:05 Performance Optimization Tips for Intl APIs

- 1:45:13 How to Format Date Ranges with Intl

- 1:46:59 Introducing the intl-date-utils NPM Package

- 1:48:27 Coding Challenge: Tasks & Assignments for You

- 1:50:13 RECAP of PART 2

- 1:51:06 The Problem with JavaScript Date History

- 1:53:11 Top 4 JavaScript Date Object Bugs Explained

- 1:57:00 Introduction to the New Temporal API

- 1:57:42 Master Temporal Types: PlainDate, ZonedDateTime & more

- 2:02:01 JavaScript Date vs. Temporal API: Side-by-Side Comparison

- 2:04:57 Browser Support & Polyfills for Temporal

- 2:06:00 Access the Source Code & Resources

- 2:06:38 Before We End...