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Timestamp Converter

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Timestamp Converter — Unix, ISO 8601 & Human-Readable

Convert between Unix timestamps, ISO 8601, and human-readable date formats.

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MAX SIZENONE
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01Paste a Unix timestamp or pick a date and time.
02The other format updates automatically across multiple time zones.
03Copy any value with one click.

About Timestamp Converter

Working with timestamps in different formats is a daily task for developers, data engineers, and system administrators. Unix timestamps (seconds since January 1, 1970), ISO 8601 strings, and human-readable dates are all common in APIs, databases, log files, and configuration systems, but converting between them manually is tedious and error-prone. This tool converts seamlessly between Unix timestamps in seconds, Unix timestamps in milliseconds (used by JavaScript and Java), ISO 8601 strings (the standard for API communication), and a human-readable date and time. Type into any one of the four fields and the other three follow. Use the 'Now' button to capture the current timestamp for quick reference, and switch the human-readable line between this device's local zone and UTC so a log line and a server clock can be compared without guessing which one you are looking at. The rail also reports the weekday and your local zone name. Common use cases include decoding timestamps from API responses, converting log file timestamps for incident analysis, generating timestamps for database queries, and verifying token expiration times.

Questions

What timezone is used?

Unix timestamps are timezone-independent (they represent seconds since 1970-01-01 UTC). The human-readable output uses your browser's local timezone.

What's the difference between seconds and milliseconds?

Unix timestamps in seconds are 10 digits (e.g., 1700000000). Milliseconds are 13 digits (e.g., 1700000000000). JavaScript's Date.now() returns milliseconds.

What is ISO 8601 and when should I use it?

ISO 8601 is the international standard for representing dates and times as a string, like 2026-05-03T14:30:00Z. Use it whenever a date crosses a system or API boundary — it removes any ambiguity about format or time zone.

Can I see the human-readable time in UTC instead of my local zone?

Yes — a Local/UTC toggle switches the human-readable line, and the rail always shows the UTC clock time plus the name of your local zone, so you can compare a server log against your wall clock without guessing.

Do dates before 1970 work?

Yes — use a negative Unix timestamp. Entering -86400 in the seconds field gives midnight December 31, 1969 UTC, and the range extends about 273,000 years in either direction (JavaScript's Date limit). Outside that range the other fields just stop updating.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.

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