Question 1

What is a Unix timestamp?

Accepted Answer

The number of seconds (or milliseconds) elapsed since 1970-01-01 00:00:00 UTC, the Unix epoch. It is a single integer used by most programming languages for time math.

Question 2

Does this tool use seconds or milliseconds?

Accepted Answer

Both — paste either form and the tool detects the unit by the magnitude. Outputs are shown in both ISO 8601 and human-readable form.

Question 3

Are timezones respected?

Accepted Answer

Conversions use UTC by default; the side panel shows the time in major world timezones using your browser's IANA database, with daylight saving time applied automatically.

Timestamp Converter