Convert Unix timestamps
Convert Unix seconds or milliseconds to ISO UTC, or an ISO instant to Unix time.
Input & settings
How to use this tool
Select the operation and fill the relevant input. Both seconds and milliseconds are included in the result.
Limits and behavior
Enter YYYY-MM-DDTHH:MM:SS with optional 1–3 fractional second digits and mandatory Z or ±HH:MM. Offset range is ±14:00. Local calendar years are 1900–2100. Invalid dates and leap seconds are rejected. Results are restricted to UTC years 1900–2100 and millisecond precision; leap seconds are not represented by Unix time. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Convert Unix epoch timestamps
Work with seconds or milliseconds since the Unix epoch and UTC ISO timestamps for logs and APIs.
Why can a timestamp display a different local time?
Unix timestamps identify instants; local clock display depends on the chosen time zone.
Related tools: convert time zones with dst · reformat dates