Are Unix timestamps in seconds or milliseconds?

Unix time is conventionally counted in seconds. JavaScript and some APIs use milliseconds, so the tool provides an explicit unit selector.

What timezone does a Unix timestamp use?

The timestamp identifies one instant relative to the Unix epoch and has no timezone of its own. UTC and local views are different representations of that same instant.

What is the Unix epoch?

It is 1970-01-01 at 00:00:00 UTC, the reference point from which Unix time counts elapsed seconds.

Unix Timestamp Converter

LocalFree

Convert between Unix epoch timestamps (seconds or milliseconds) and human-readable dates with full timezone support.

Current Unix time

Timestamp → Date

UTC:

Local:

ISO:

Relative:

Date → Timestamp

Seconds:

Milliseconds:

ISO:

Runs in your browser; files and input stay on this device

How to use Unix Timestamp Converter

1Enter a Unix timestamp and choose whether it is in seconds or milliseconds.
2Read the UTC, local, ISO 8601, and relative representations.
3To convert the other way, choose a date and time and read its seconds and milliseconds timestamps.

Frequently asked questions

Are Unix timestamps in seconds or milliseconds?: Unix time is conventionally counted in seconds. JavaScript and some APIs use milliseconds, so the tool provides an explicit unit selector.
What timezone does a Unix timestamp use?: The timestamp identifies one instant relative to the Unix epoch and has no timezone of its own. UTC and local views are different representations of that same instant.
What is the Unix epoch?: It is 1970-01-01 at 00:00:00 UTC, the reference point from which Unix time counts elapsed seconds.