there's a calendar button on the top of the campign lists, on the right side. I had trouble finding it, but i finally got it.
I've heard that there's about a three hour lag in report data, but I can't remember where I got that information. I think I might have heard it from a Yahoo rep back when I worked for a PPC agency. I can't find anything that verifies this in YSM help, though.
He's right, it's about a 3 hour lag. Beware however that Yahoo's server is fragile and the conversion data often breaks for upwards of four days. We've gone long periods of time driving in the dark per say, not knowing how many conversions Yahoo actually made for us.