Does it use seconds or milliseconds?

Both. It auto-detects based on the number of digits — roughly 10 digits is treated as seconds and 13 digits as milliseconds — and tells you which it assumed.

What timezone are the results in?

The tool shows both UTC and your browser's local timezone so you can compare them directly.

Unix Timestamp Converter — Epoch to Date

Current Unix time…

Epoch → date

Waiting for input…

Date → epoch (your local timezone)

Runs entirely in your browser. Nothing you paste is uploaded, logged, or stored.

What it does

Converts a Unix epoch value (seconds or milliseconds since 1970-01-01 UTC) into human-readable UTC and local times, and converts a date back into a timestamp. It auto-detects whether you pasted seconds or milliseconds based on magnitude.

Seconds vs milliseconds

Unix time is classically measured in seconds, but JavaScript and many APIs use milliseconds. A 10-digit number is almost always seconds; a 13-digit number is milliseconds. The converter picks the right one automatically and shows you which it assumed.

FAQ

Does it use seconds or milliseconds?: Both. It auto-detects based on the number of digits — roughly 10 digits is treated as seconds and 13 digits as milliseconds — and tells you which it assumed.
What timezone are the results in?: The tool shows both UTC and your browser's local timezone so you can compare them directly.

What it does

Seconds vs milliseconds

FAQ

Other tools