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 are the tool’s own code and, once cached, none at all.
Frequently asked questions
Seconds or milliseconds?
Unix time is defined in seconds, and that is what most APIs and databases use. JavaScript uses milliseconds, which is why a date sometimes lands in 1970 — a value 1000× too small. Both fields are shown so the mistake is visible.
Does anything leave my browser?
No. There is no server behind this page doing the work and no API being called — the whole tool is JavaScript running in the tab. Load it once and it keeps working with the connection off.