Viewing Yesterday's New Posts

[Joy]

OK, occasionally I don't get checked in daily like I plan to, or when looking at the new posts since my last visit to the forum I get interrupted, my computer shuts off and when I visit the forum again, it thinks I have already viewed all those posts that were indeed up on the computer but really I didn't. Did that make any sense? Also sometimes when doing something on the internet my computer will first link to the forum, so again thinks I have seen the posts, when I have not, and I cannot readily access them. So onto my question....is there a way to set the parameters to search for new posts within a certain period of time? Currently, I look at the forums I have subscribed to....but there seems like there should be a better way.