Unix Timestamp Converter

Online tool for converting Unix timestamp to date and back: seconds, milliseconds, UTC, local time, and ISO.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

Unix Timestamp Converter is a free online tool for converting Unix time to readable dates and back. It is useful for server logs, API responses, JWT claims, webhooks, and databases. Processing runs locally in your browser.

What it does

Output

Processing

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How to use

Paste a Unix timestamp in seconds or milliseconds, or a date in ISO format.
Keep Auto mode or choose conversion direction manually.
Check the result in local time, UTC, ISO 8601, Unix seconds, and Unix milliseconds.
Copy the result for logs, API, JWT exp/iat/nbf, backend debugging, or documentation.

More about this tool

Unix Timestamp Converter converts Unix time to readable dates and back. The tool recognizes timestamps in seconds and milliseconds and shows local time, UTC, ISO 8601, RFC 3339, Unix seconds, and Unix milliseconds.

It is useful when parsing server logs, API responses, JWT claims exp, iat, and nbf, webhook payloads, databases, and JavaScript Date.now(). Conversion runs locally in the browser.

Data is not sent to the server.

Converts Unix timestamp to date
Converts date back to timestamp
Supports seconds and milliseconds
Shows local time, UTC, and ISO 8601
Useful for logs, API, JWT, and backend debugging
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What is a Unix timestamp?

A Unix timestamp is the number of seconds or milliseconds since 1970-01-01T00:00:00Z. This format is common in APIs, logs, databases, and JWT.

What is the difference between seconds and milliseconds?

Unix timestamp in seconds usually has about 10 digits, e.g. 1700000000. Timestamp in milliseconds usually has about 13 digits, e.g. 1700000000000.

How do I convert a timestamp to a date?

Paste the timestamp and choose "Timestamp to date" mode or leave "Auto". The tool shows local time, UTC, and ISO format.

How do I get a timestamp from a date?

Paste a date, e.g. 2024-01-01 or 2024-01-01T00:00:00Z, and the tool shows Unix seconds and Unix milliseconds.

Why does local time differ from UTC?

UTC is unified world time without local offset. Local time depends on the browser timezone or selected UTC offset.

Is this tool suitable for JWT exp?

Yes. Claims exp, iat, and nbf in JWT are usually stored as Unix timestamp in seconds. The converter helps quickly understand token lifetime.

What is JavaScript Date.now()?

Date.now() returns Unix timestamp in milliseconds, so it is usually longer than timestamp in seconds.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.

More about this tool

It is useful when parsing server logs, API responses, JWT claims exp, iat, and nbf, webhook payloads, databases, and JavaScript Date.now(). Conversion runs locally in the browser.

Data is not sent to the server.

Converts Unix timestamp to date
Converts date back to timestamp
Supports seconds and milliseconds
Shows local time, UTC, and ISO 8601
Useful for logs, API, JWT, and backend debugging
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What is a Unix timestamp?

A Unix timestamp is the number of seconds or milliseconds since 1970-01-01T00:00:00Z. This format is common in APIs, logs, databases, and JWT.

What is the difference between seconds and milliseconds?

Unix timestamp in seconds usually has about 10 digits, e.g. 1700000000. Timestamp in milliseconds usually has about 13 digits, e.g. 1700000000000.

How do I convert a timestamp to a date?

Paste the timestamp and choose "Timestamp to date" mode or leave "Auto". The tool shows local time, UTC, and ISO format.

How do I get a timestamp from a date?

Paste a date, e.g. 2024-01-01 or 2024-01-01T00:00:00Z, and the tool shows Unix seconds and Unix milliseconds.

Why does local time differ from UTC?

UTC is unified world time without local offset. Local time depends on the browser timezone or selected UTC offset.

Is this tool suitable for JWT exp?

Yes. Claims exp, iat, and nbf in JWT are usually stored as Unix timestamp in seconds. The converter helps quickly understand token lifetime.

What is JavaScript Date.now()?

Date.now() returns Unix timestamp in milliseconds, so it is usually longer than timestamp in seconds.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.