Calculators

Unix timestamp converter

Convert Unix seconds or milliseconds to date and time, with UTC and local display. Free, no sign-up, right in your browser.

Free · No sign-up · No subscription

Workspace

Locally in your browser

Result

Ready when you are.Your result will appear here after processing.

Questions about this tool

How does this tool work: Unix timestamp converter?

Free, no sign-up, right in your browser. Choose direction and unit. Enter a timestamp or ISO date, or insert “Now”. Compare UTC and local time and copy the result.

Why does my device show a different time than UTC?

A timestamp identifies an instant. UTC and your local timezone display that same instant with different clock times. An ISO offset such as +03:00 is accounted for during conversion.

What inputs, outputs and limits apply?

Input: Integer Unix value or ISO date with Z or a timezone offset. Output: UTC, local time, Unix seconds and milliseconds. Limits: Choose milliseconds or seconds explicitly. ISO input requires a timezone, e.g. 2026-01-01T12:00:00+03:00. No leap seconds; seconds are rounded down when milliseconds remain. Local display uses your device timezone.

More questions about files, downloads and ToolMint →

Instructions, example and file limits

Formats, inputs and limits

Input: Integer Unix value or ISO date with Z or a timezone offset
Output: UTC, local time, Unix seconds and milliseconds
Limits & notes: Choose milliseconds or seconds explicitly. ISO input requires a timezone, e.g. 2026-01-01T12:00:00+03:00. No leap seconds; seconds are rounded down when milliseconds remain. Local display uses your device timezone.