Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to local, ISO and UTC dates.
Frequently Asked Questions
What’s the difference between a timestamp in seconds vs. milliseconds?
A standard Unix timestamp is measured in seconds since January 1, 1970 (UTC). Some systems (like JavaScript) use milliseconds instead. The tool automatically detects which unit is likely based on the number’s size.
Is the displayed date in my local time zone?
Yes — the "Date and time" field shows your browser’s local time zone, alongside the global UTC and ISO 8601 dates.
What happens if I enter an invalid number?
The tool shows an "Invalid timestamp" message rather than guessing at a wrong date.