Does it handle milliseconds?

Yes. If the number is larger than 1 trillion, it's treated as milliseconds. Otherwise, it's treated as seconds.

What date formats are supported?

Any format that JavaScript's Date constructor can parse: ISO 8601, RFC 2822, and common date strings.

The tool shows both UTC and your local timezone.

Developer Tools

Convert between Unix timestamps and human-readable dates.

100% client-side — your text never leaves your browser

Input

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Output

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Enter a Unix timestamp (seconds or milliseconds) to convert to a readable date.
Or enter a date string (like '2024-01-15' or 'January 15, 2024') to get the timestamp.
Both directions are handled automatically.