Unix Timestamp Converter
Convert Unix seconds or milliseconds to ISO time, or convert an ISO date back to Unix.
How to use
Enter an integer Unix timestamp and choose seconds or milliseconds.
Select Unix → ISO to see UTC and local time.
For the reverse conversion, enter an ISO date with Z or an explicit timezone offset.
FAQ
How do I use this tool?
Enter an integer Unix timestamp and choose seconds or milliseconds. Select Unix → ISO to see UTC and local time. For the reverse conversion, enter an ISO date with Z or an explicit timezone offset.
What does timestamp 0 mean?
It represents 1970-01-01 at 00:00:00 UTC. Your local display can show a different date or hour.
Why must the ISO value include a timezone?
A timezone such as Z or +09:00 removes ambiguity. Local formatting uses the timezone configured on your device.
Are my inputs uploaded?
Tool inputs are processed in your browser. Advertising makes separate requests as described in the privacy policy.