Convert Unix timestamps between seconds, milliseconds, UTC, and local dates, and convert date-time values back to timestamps.

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Unix Timestamp Converter is a free browser-based utility in the fas fa-clock category. Convert Unix timestamps in seconds or milliseconds to UTC and local dates, and convert date-time values back to Unix timestamps.

What Is a Unix Timestamp?

A Unix timestamp represents elapsed time relative to the Unix epoch and is commonly used in APIs, logs, databases, and development work.

• Confirm whether a system expects seconds or milliseconds.
• Use UTC when exchanging timestamps between systems.
• Review timezone assumptions for human-facing dates.

How to Use the Converter

Enter a timestamp and choose its unit, or use the date-to-timestamp section to convert a local date and time.

Frequently Asked Questions

Is Unix Timestamp Converter free?

Yes. The core workflow runs in your browser without requiring a paid account.

Is my data uploaded?

The tool is designed to process its inputs locally in the browser. Avoid entering secrets unless you have reviewed your own deployment and privacy requirements.