[igorguerrero]

Yeah this makes it better, but I've found some sites that don't do that, blogs and news articles where it's impossible to find the date of published... Is it a SEO trick to make your content always relevant?

[reillys]

Well it will definitely help with caching. You only need to update the article every year or so.

[fngjdflmdflg]

That's still more than just using an exact date that never needs to be updated. Also that seems like something you would do client side anyway. ie. you send a timestamp that never changes and then have the client convert it to "X years/days ago."