What is a UNIX timestamp?

A UNIX timestamp is the number of seconds (or milliseconds) that have elapsed since 1970-01-01T00:00:00Z (the Unix Epoch).

Does this tool support seconds and milliseconds?

Yes — 10-digit values are treated as seconds and 13-digit values as milliseconds. Other lengths are attempted as milliseconds with a warning.

Can I view UTC and local time?

Yes. Results show local time, optional US/EU formats, and UTC output for unambiguous comparison.

Completely. All conversions happen in your browser; nothing is uploaded.

Timestamp Converter (UNIX ↔ Date) – Epoch Seconds & Milliseconds

Timestamp Converter (UNIX ↔ Date)

Enter a UNIX timestamp or a date and convert between the two formats.

UNIX Timestamp:

Human-Readable Date/Time:

Result:

About the UNIX Timestamp Converter

A UNIX timestamp (often called epoch time) is a single number that represents a moment in time relative to 1970-01-01T00:00:00Z. Developers and databases love timestamps because they’re compact, timezone-agnostic, and easy to compare or sort. This tool lets you convert UNIX ↔ human-readable date/time instantly, with support for both seconds (10-digit) and milliseconds (13-digit).

Enter a timestamp to see formatted output in your local time, alongside handy views for US (MM/DD/YYYY), EU/UK (DD/MM/YYYY), and UTC. Going the other way, paste or type a readable date (e.g., 2025-03-01 10:30:00 or ISO-8601 like 2025-03-01T10:30:00Z) to get epoch seconds and milliseconds. Everything runs client-side, so your data never leaves your device.

A quick tip on parsing: date strings without a timezone are interpreted in the user’s local timezone by most browsers, while strings ending with Z or an offset (e.g., +00:00) are treated as UTC. For unambiguous results, prefer ISO-8601 (e.g., 2025-03-01T10:30:00Z). If your timestamp length isn’t 10 or 13 digits, the converter will still attempt to parse it as milliseconds and warn you.

FAQs

Is a UNIX timestamp affected by time zones?

No. The timestamp encodes an absolute moment; only its display changes with time zone or DST rules.

Seconds vs. milliseconds—what should I use?

Back-end systems and APIs often use seconds; browsers and JavaScript typically use milliseconds. This tool handles both.

Can I copy results in ISO-8601?

Yes—use the UTC output for ISO-8601 style strings like YYYY-MM-DDTHH:mm:ssZ.

Is it private?

Yes. Everything is calculated in your browser, with no network requests for conversions.

⭐ Starlight Tools / Timestamp Converter