QronoJust right date time library

Simple, immutable, and powerful date-time manipulation for JavaScript

Get Started

API Reference

🚀

Simple & Intuitive

Easy-to-use API designed for common date-time operations without the complexity

🔒

Immutable

All operations return new instances, ensuring your data remains predictable and safe

⚡

Lightweight

All features packed into just 4kB. Pure JavaScript without dependencies. Minimal bundle size for optimal performance

🌍

Unique DST Handling

The only library with dedicated APIs for daylight saving time transitions — detect, inspect, and handle edge cases properly

🔧

TypeScript Ready

Full TypeScript definitions included for type-safe development

🎯

Chainable API

Fluent method chaining for expressive and readable date-time transformations

Quick Start

npmbundenobrowser

npm install qrono

bunx jsr add @urin/qrono

deno add jsr:@urin/qrono

html

<script src="https://unpkg.com/qrono/dist/qrono.min.js"></script>

javascript

import { qrono } from 'qrono'

// Get current time
const now = qrono()

// Add 7 days
const nextWeek = now.plus({ day: 7 })

// Comparisons work naturally
if (now < nextWeek) {
  ...
}

// ISO 8601 format (UTC default)
now.toString()                        // 2026-02-08T21:28:12.214Z
qrono({ localtime: true }).toString() // 2026-02-08T17:28:12.214-04:00

Learn More

Introduction - Design philosophy and getting started
API Reference - Complete API documentation