How does World Clock work without uploading my data?

World Clock runs entirely inside your browser's sandbox: the page loads once, and every operation after that executes on your own device's CPU. No input, file, or result is transmitted to any server — you can even watch the network tab stay silent while you use it.

Does World Clock cost anything or require an account?

No. World Clock is completely free with no usage caps, subscriptions, or sign-up forms — supported by unobtrusive ads, and usable for personal and commercial work alike.

Can I use World Clock on a phone or offline?

Yes. The layout adapts to phones and tablets, and because the logic ships as static client-side code, World Clock keeps working on intermittent connections once the page has loaded.

World Clock

Q: What exactly does World Clock do?

Compare time across world cities Check the current time in cities across every timezone at a glance, and add your own. Great for scheduling meetings across time zones without doing offset math in your head.

Compare time across world cities

Free Private No uploads

World clock

updated every second

Your local time

Local time

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New York

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London

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Berlin

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Dubai

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Mumbai

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Shanghai

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Tokyo

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Sydney

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Add a city

Times come from the official IANA timezone database built into your browser, including daylight-saving rules. The moon/sun icon shows whether it is night (8pm–6am) in that city.

100% Private & In-Browser

Processed locally using client-side JavaScript. Your files and data never touch any server.

Instant & Unlimited

No registration, no waiting queues, and no limits on file conversions or generations.

Tool Overview & Guide

What is World Clock?

Check the current time in cities across every timezone at a glance, and add your own. Great for scheduling meetings across time zones without doing offset math in your head.

Step-by-Step Instructions

How to use World Clock

Open World Clock in any modern web browser on your computer, tablet, or smartphone.

Type, paste, or configure your input data and parameters in the World Clock interface.

The tool processes your data in real time directly on your device using the browser's high-precision performance timers and Internationalization (Intl) API.

Copy your generated result to your clipboard, preview the output, or save your file with a single click.

Key Capabilities

Instant Unlimited Free Usage — no daily limits, feature gates, paywalls, or account registrations required.
Cross-Platform Compatibility — works the same across Windows, macOS, Linux, iOS, and Android.
High-Precision Timing — uses your device's monotonic clock and the Internationalization (Intl) API.
Compare time across world cities

Common Use Cases

Remote teams, project managers, developers, and global travelers who need to track, calculate, and synchronize time intervals across worldwide standards without installing software.
Check the current time in cities across every timezone at a glance, and add your own. Great for scheduling meetings across time zones without doing offset math in your head.
Handling private or confidential material that should not be uploaded to third-party cloud services.
Running a quick one-off task — once loaded, most tools keep working even if the connection drops.

Clear Answers

Frequently Asked Questions

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