Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, and your local timezone.
How to Convert Unix Timestamps Online
ToolsPix Timestamp Converter lets you instantly convert Unix timestamps to human-readable dates and back using JavaScript's Date API, directly in your browser. There is no software to install, no account to create, and no data is sent to any server.
Why use ToolsPix Timestamp Converter?
- Completely free with no limits on the number of conversions.
- All conversions happen locally in your browser — no data is sent to any server.
- Works on Windows, Mac, Linux, iPhone, and Android — anywhere with a modern browser.
- Supports seconds and milliseconds, and displays results in UTC, ISO 8601, local time, and relative time simultaneously.
- No watermarks, no sign-up, and no third-party trackers.
Steps to convert a timestamp
Enter any Unix timestamp in the input field — the tool auto-detects seconds versus milliseconds — and click Convert. Results appear instantly in UTC, ISO 8601, your local timezone, and as a relative time (e.g. "3 days ago"). Use the date picker to convert a human-readable date back to a Unix timestamp. Once the page is loaded, the tool also works completely offline.
FAQ
Seconds vs milliseconds — which should I use?
Unix timestamps are traditionally in seconds. However, JavaScript's Date.now() and many modern APIs return milliseconds (13-digit numbers). If your timestamp has 13 digits, it's likely milliseconds; 10 digits means seconds.
What timezone does this converter use?
The UTC output is always timezone-neutral. The "Local" output uses your browser's system timezone automatically. You can see both side by side in the results.
What is the Unix epoch?
The Unix epoch is the reference point: January 1, 1970 at 00:00:00 UTC. All Unix timestamps count seconds (or milliseconds) from this moment. It was chosen when Unix was designed in the late 1960s.
What is the Year 2038 problem?
32-bit systems store Unix timestamps as signed integers, which overflow on January 19, 2038 at 03:14:07 UTC. Modern 64-bit systems don't have this limitation and can handle dates billions of years into the future.