Unix Timestamp Converter
Turn Unix timestamps into readable dates and back, with automatic unit detection.
Timestamp → date
Date → timestamp
Runs 100% in your browser. Your files are not uploaded to any server.
How to use Unix Timestamp Converter
- Paste a timestamp on the left — seconds, milliseconds, microseconds and nanoseconds are detected automatically.
- Read the date in your local time zone, UTC, ISO 8601 and relative to now.
- To go the other way, pick a date and time on the right and copy the timestamp.
Frequently asked questions
What is a Unix timestamp?
It is the number of seconds since 1 January 1970 00:00:00 UTC. Many systems use milliseconds instead — this tool detects which one you pasted.
Which time zone is used?
Your device's time zone for “Local” and UTC for the UTC row. Tick “Treat as UTC” on the right to enter a UTC date.
Is Unix Timestamp Converter free?
Yes. Unix Timestamp Converter is free to use with no sign-up and no watermark.
Are my files uploaded to your server?
No. All processing happens locally in your browser using JavaScript and WebAssembly. Your files never leave your device, which also makes it fast and private.
Does it work on my phone?
Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.