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Unix timestamp converter
Convert Unix timestamps to dates or ISO dates to seconds and milliseconds.
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Unix timestamp converter
Convert Unix timestamps to dates or ISO dates to seconds and milliseconds.
Input
Choose seconds or milliseconds explicitly. Dates require ISO 8601 with Z or an offset, e.g. 2026-01-01T00:00:00+07:00. Output includes UTC and your device timezone. Leap seconds are not supported.
Unix timestamp converter — What this tool does
Convert Unix timestamps to dates or ISO dates to seconds and milliseconds.
- Input and output
- ISO 8601 / Unix timestamp → JSON
- Options you can adjust
- Mode · Timestamp unit
How to use it
- Paste your input or use the example. Choose the input format before running.
- Adjust the available settings to suit the result you need. Your choices apply when you run the tool. Mode · Timestamp unit.
- Run the tool, review the result and any warnings, then download or copy the output. Larger files may take longer on your device.
Limits and output quality
Choose seconds or milliseconds explicitly. Dates require ISO 8601 with Z or an offset, e.g. 2026-01-01T00:00:00+07:00. Output includes UTC and your device timezone. Leap seconds are not supported.
Frequently asked questions
What result will I get?
JSON. Convert Unix timestamps to dates or ISO dates to seconds and milliseconds.
Are my files uploaded to a server?
Files and text are processed in this browser tab, without server uploads or analytics. Language and theme preferences are saved on this device. Closing the tab releases the working files. On the first visit, the site uses the hosting provider’s approximate IP country when available, then your browser language. A language cookie remembers your choice for one year. You can change it at any time.
Will this change my original file?
No. The tool creates a separate result for you to review and download. Keep the original until you have checked the exported content.
Enter input to begin.
Enter input to begin.