Not sure if this is the right forum to ask this, but I have heard that search engines like new content. I am currently working to generate dyynamic pages which include something like this in the header
Now, if I do this programatically the date will be updated any time I make a change in the page, no matter how minor, even changing a couple of words in the title.
Would this have negative effects? If so, should the date only be changed if there is a significant change or addition to page content? If yes to that, what percent change to content would be considered "significant?" I want to continually update the pages but don't want to adversely affect rankings.