In the old YouTube, you could have your video search results ordered by upload date, handy if you want to check out the latest uploaded video on a subject, and browse through them in chronological order
Google, in all of their infinite wisdom, have ditched that very useful option and replaced it with "Today," "this week," "this month" and "this year." And it doesn't sort those results into chronological order, you get them by relevance or something. Which I'm sure is helpful in some circumstances. But if you need to see the uploaded videos in order of upload, you're now screwed.
Boy am I sick of software developers and their pathological obsession with removing useful features that you'd come to rely on. Guess they know better than us though, eh?