Convert timestamps
Six representations of the same instant, all linked. Edit whichever one you have and the rest follow.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Press Now, or type into any field.
- Read the other five.
- JST is included because it is the one most converters leave out.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
Seconds or milliseconds?
Unix time is defined in seconds, and that is what most systems and databases use. JavaScript counts in milliseconds instead, which is why a date sometimes lands in 1970: the value is 1000 times too small. Both fields are shown so the mistake is easy to spot.
Does anything leave my browser?
No. Nothing is sent to a server. The whole tool is a small program that runs inside your browser tab. Once the page has loaded, it keeps working even with the internet switched off.