Thread:Project:Support desk/Is this possible to do?

Is it possible to, without extensions, to have a page show how far a number is from another number?

In other words, I want a page to say "This year was X years ago.", and X is the current year (Which I can set manually, as this is a wiki about another fictional universe) minus the name of the page.

I can't add extensions, as I'm using a wikihost that doesn't let you do that.