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Unix Timestamp Converter

Convert Unix seconds or milliseconds to UTC and convert an ISO date back to Unix time.

Workspace⌁ Processed on your device

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Processed on your device

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How it works

Convert Unix seconds or milliseconds to UTC and convert an ISO date back to Unix time. Enter your values or try the example. Run the action, check the result and copy or download it. Your input remains editable after an error.

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Example

1704067200 s ↔ 2024-01-01T00:00:00.000Z
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When to use this tool

Compare a numeric log timestamp with a readable UTC date.

Supported formats & limits

Choose seconds or milliseconds explicitly. ISO dates require a timezone. Results are in UTC; daylight-saving rules are not inferred. Invalid or out-of-range dates are rejected.

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Good to know

What happens when I change the input?

An edited input needs a new result. Run the action again; previous download links are removed so you cannot mistake an old output for the current one.

Are my files uploaded?

Your files and pasted content are processed in temporary browser memory and are not uploaded for processing. App preferences store only tool IDs, language and theme. There are no accounts, ads or automatic error reports. Closing the page discards your workspace; download results you want to keep. Production pages use Google Analytics for visit statistics; see the Privacy page for details.