Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports auto-detection of seconds and milliseconds, local and UTC output, and a live ticking clock.
About Unix Timestamp Converter
Overview
The Unix Timestamp Converter is a fast, browser-based tool that converts between Unix timestamps and human-readable dates. It supports both seconds and milliseconds, with automatic unit detection, and displays results in your local time and UTC at the same time. A live ticking clock at the top of the page shows the current Unix time so you always have a quick reference. The reverse direction lets you pick a date and time with the native browser picker and immediately see the corresponding Unix timestamp in seconds or milliseconds. Whether you are debugging an API response, reading a database log, or just curious about what a timestamp means, this tool gives you an instant, private answer. Everything runs on your device, so your data never leaves the browser.
Features
- Converts Unix timestamps to dates in both local time and UTC.
- Converts dates back to Unix timestamps in seconds or milliseconds.
- Auto-detects whether a timestamp is in seconds or milliseconds.
- Manual override for seconds vs milliseconds on both directions.
- Live ticking current timestamp shown in seconds and milliseconds.
- Copy buttons for every value (current seconds, current milliseconds, local date, UTC date, and the date-to-timestamp result).
- All processing happens locally in your browser; no data is sent to a server.
- Dark mode, keyboard navigation, and responsive layout from mobile to desktop.
How to Use
- Look at the "Current Unix Timestamp" card to see the live seconds and milliseconds values ticking every second.
- Enter a Unix timestamp in the "Timestamp to Date" card. Choose Auto-detect to let the tool decide between seconds and milliseconds, or pick a unit manually.
- Read the converted date in your local time and in UTC. Use the Copy buttons to copy either value to your clipboard.
- Pick a date and time in the "Date to Timestamp" card, or click "Now" to fill in the current moment.
- Choose Seconds or Milliseconds for the output, and copy the resulting timestamp with one click.
- Use the "USE CURRENT TIMESTAMP" button to copy the live timestamp into the converter, or "Clear" to reset all inputs.
FAQ
How does the tool know if my timestamp is in seconds or milliseconds?
In auto-detect mode, the tool checks the size of the number. Any value with an absolute size of 100,000,000,000 (10^11) or larger is treated as milliseconds; smaller values are treated as seconds. You can also pick Seconds or Milliseconds manually to override this choice.
What is the difference between local time and UTC time?
UTC is the global time standard and does not change with your location. Local time is your wall-clock time, adjusted by the timezone configured in your operating system. The tool shows both side by side so you can compare them at a glance.
Is my data sent to a server when I use this tool?
No. Every conversion is performed entirely inside your browser using the built-in JavaScript Date object. The page never makes a network request with your input, so timestamps and dates stay private on your device.
Can I convert dates before January 1, 1970?
Yes. Negative Unix timestamps represent dates before the Unix epoch. For example, -86400 is one day before January 1, 1970. The tool accepts negative values in both directions of conversion.