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Timestamp

Unix seconds and milliseconds, timezone-qualified ISO 8601 and RFC 2822, UTC forms and relative time.

Runs in your browser; nothing is uploaded

Choose seconds or milliseconds explicitly. Calendar inputs need a numeric timezone or Z. Output is labelled UTC. Nothing is uploaded.

Time with explicit units

Timestamp converts Unix seconds or milliseconds, ISO 8601 with a timezone, and a numeric-zone RFC 2822 form. The result shows Unix forms, UTC ISO and RFC dates, and a relative explanation. Use now captures the browser's current clock.

Validation and privacy

A calendar input must be a complete anchored date with a timezone. Invalid calendar dates and mismatched RFC weekdays are refused rather than normalized. Conversion runs locally. The share link uses a URL fragment that is not sent to the server.

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