It Took 30 Years to Fix Dates in JavaScript 😱 | Temporal API

JavaScript took 30 years to fix dates! In this video, learn the JavaScript Temporal API (ES2026) — the modern replacement for the broken Date object. We cover zero-indexed months, timezone bugs, and mutable dates, then fix all of them with Temporal.

Temporal API in Hindi: is video mein hum dekhenge ki new Date() mein kya problems thi aur Temporal API unko kaise fix karta hai — simple examples ke saath.

🔥 What you'll learn:
✅ Why new Date(2026, 11, 25) gives December, not November
✅ Why console.log(date) shows the wrong day (UTC vs local time)
✅ Temporal.PlainDate – create dates with months starting from 1
✅ Temporal.ZonedDateTime – handle timezones and convert with withTimeZone()
✅ Why the Date object is mutable and how Temporal is immutable
✅ Get & set dates the Temporal way – properties, add(), subtract() and with()
✅ Node.js 26 requirement for Temporal + @js-temporal/polyfill for older versions

💡 Quick Example:
const today = Temporal.Now.plainDateISO();
const nextWeek = today.add({ days: 7 });

Temporal reached Stage 4 in March 2026 and is part of ES2026. It is enabled by default in Node.js 26, so you no longer need heavy libraries like Moment.js for most date and timezone work.

📌 Use Node.js 26+ or install the polyfill:
npm install @js-temporal/polyfill

#javascript #temporalapi #es2026

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⌛TIMELINE⏳
0:00 Intro – 3 Problems with JavaScript Date (Animated)
1:45 Old Date Object – Zero-Indexed Months & UTC Confusion
4:30 Temporal API – Timezones with ZonedDateTime
6:00 Problem: Date Object Is Mutable (setDate & getDate)
9:02 Temporal API Is Immutable – add(), with() & Getters
10:50 Node.js 26 Required for Temporal (+ Polyfill Fix)
12:20 What's Next – More ES2026 Features