About whattimeisitin.app

whattimeisitin.app is a clean, fast timezone lookup tool. Type any city and instantly see the current local time — no sign-ups, no downloads, no nonsense.

What it does

We show you the current time in over 100 cities worldwide. Every clock on this site ticks live, updates every second, and is accurate to your device's system clock. You can search for any city, compare timezones, and plan meetings across time zones.

Privacy first

This site does not use cookies. It does not collect personal data. It does not run analytics. Your timezone is detected client-side using your browser's built-in Intl API — no data is sent to any server. The only thing stored locally is your theme preference (dark or light mode), saved in your browser's localStorage.

How it works

All timezone calculations happen right in your browser using the Intl.DateTimeFormat API, which pulls from the IANA Time Zone Database. This means accurate, DST-aware times without any external API calls or paid services.

• Timezone detection and conversion via the browser's Intl API
• Sunrise and sunset calculated with simplified solar position formulas
• No external dependencies — no CDN, no third-party scripts
• Every page is a standalone static HTML file

Built with

• Vanilla HTML, CSS, and JavaScript — no frameworks, no build tools
• Hosted on Vercel
• IANA timezone data via the browser's built-in Intl API

Tools

Beyond the world clock, we offer a few useful timezone tools:

• Time Converter — Convert a time from one city to another
• Time Difference Calculator — See the exact hour difference between two cities
• Meeting Planner — Find overlapping business hours across 2-5 cities

Contact

Questions or suggestions? Reach out at hello@whattimeisitin.app.