Unix Timestamp Converter

About this Unix timestamp converter

This tool converts between Unix epoch timestamps and human-readable date strings. It auto-detects whether your input is in seconds, milliseconds, microseconds, or nanoseconds based on its digit count, and renders the result across common formats including ISO 8601, RFC 2822, locale strings, and relative time. Everything runs locally in your browser — no data leaves your device.

Supported epoch units

10-digit values are interpreted as seconds, 13-digit values as milliseconds, 16-digit as microseconds, and 19-digit as nanoseconds. You can override the detected unit at any time. Internally we use BigInt arithmetic, so high-precision values stay exact.

Multi time-zone view

Add any IANA time zone (e.g. Europe/London, Asia/Shanghai) to see the parsed instant rendered in that zone. Your browser's local zone is added automatically alongside UTC.

FAQ

Are seconds and milliseconds detected automatically?

Yes. If your input is a plain integer of 10 digits or fewer it is treated as seconds; 12–14 digits as milliseconds; 16-ish as microseconds; 19-ish as nanoseconds.

Is my data sent to a server?

No. Parsing, formatting, and time-zone conversions all run client-side using the standard Intl APIs.

Does it handle dates beyond Y2038?

Yes. We use BigInt for epoch math and JavaScript Date for formatting, so any instant within ±100 million days of the epoch is supported.

Can I share a specific conversion?

Yes — the URL updates automatically as you change the input, unit, or time zone list, so you can copy the address bar to share the exact view.