Unix timestamp ⇄ human-readable date
Seconds, millis, ISO and local, live.
Files stay on your device. No accounts. Free.
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About this tool
Type a Unix timestamp, seconds or milliseconds, auto-detected, or any date string, and see every useful form at once: Unix seconds, milliseconds, ISO 8601 UTC, your local time, and relative time. One click loads the current moment.
A small tool you reach for constantly when reading logs, debugging APIs and writing queries. Runs entirely in your browser.
How it works
- Paste your input, or drop a text file onto the box.
- The output updates live as you type.
- Copy it to the clipboard, or download it as a file.
Frequently asked questions
How does it know whether my number is seconds or milliseconds?
By magnitude. Recent dates are ten digits in seconds and thirteen in milliseconds, so the tool detects which one you pasted and labels the interpretation it chose.
Can I convert a date back into a Unix timestamp?
Yes, type or paste any common date string, ISO 8601 or a human-readable form, and the Unix seconds and milliseconds appear alongside the other formats.
Which timezone do the results use?
You get both: ISO 8601 in UTC, plus the same moment rendered in your device's local timezone, labelled clearly so log times and wall-clock times stop getting confused.