DEVELOPER / FREE ONLINE TOOL
Unix Timestamp Converter
Convert Unix seconds or milliseconds to and from UTC.
Free to use On-device processing No account needed
Your workspace Runs privately in your browser
Your result
A little guidance.
Convert an integer Unix timestamp to an ISO UTC date, or a UTC date and time to Unix seconds and milliseconds. Leap seconds are not represented.
How it works
- Enter your values, or use the example to get started.
- Select “Convert timestamp” to process your input in your browser.
- Review the result, then copy or download it when available.
Good to know.
Which time zone is used?
All conversions use UTC. UTC date input can end in Z. Offset date strings are not accepted, avoiding ambiguous local-time interpretation.
Is my input sent to a server?
No. This tool runs in your browser. KILIZU does not upload or store the values or files you enter here.