Carbon-date a website. Give us an address, then scroll down through its real history, with every date shown beside its source.
Or try a known dig
How the dating works
We ask the domain registry when the address was registered, then read saved copies of the page from the Internet Archive. Those copies become the layers, oldest at the bottom, each with a link to the copy itself.
Comparing the copies shows when this version went up. A date on the tag is always a fact from a named source. If a source has nothing, we say so.