Date Object — Complete Guide
Date Object — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of JavaScript Tutorial on Toolliyo Academy.
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JavaScript Tutorial · Lesson 34 of 100
Date Object
Basics ✓ → Objects & data → Async & DOM → Advanced → Tools → Projects
Intermediate · 2 — Built-in types & objects · ~6 min · JS Strings, Dates & RegEx
What is this?
The Date object represents a moment in time. You create it with new Date() and read parts with getFullYear, getMonth, etc.
Why should you care?
Show "last updated", countdowns, and sort records by time.
See it live — copy this example
Paste into an HTML file or the browser console (F12). Use Run below when the live editor is available.
const now = new Date();
console.log(now.toString());
console.log(now.getFullYear());
console.log(now.toISOString());Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- new Date() captures now.
- Months are 0-based (0 = January).
- toISOString is UTC format for APIs.
Practice next
- Log new Date() parts with getFullYear and getMonth.
- Parse new Date("2026-06-23").
- Compare dates with getTime().
- Compute days until a deadline Date from today.
- Format with toLocaleDateString("en-IN", { weekday: "long" }).
Remember
new Date() for now get* methods read parts toISOString for APIs
ScriptVerse statement period
Banking dashboard shows "Last updated" using Date and formats it for Indian locale.
Outcome: Correct date handling prevents off-by-one month bugs in financial UIs.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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