This has been the case with Direct X for as long as I can remember, If it's not downloadable from the MS DX site then it is still beta. You also found the simple solution to keep D3D games working if it runs out before you find the next beta version or a full one is released. I can only see it being an issue if having a correct date on your PC at all times matters to you. If not put you date back a bit when it runs out.
Unfortunately I like having the correct date since I also run programs that require the correct date. Personally I see it being a pain to change the date everytime I want to run a game, and then changing it back when I need the correct date.
Better to wait for the official version than using this beta. Besides, most of the post about it here have notice no difference so why do it anyway? I just posted this here for any newbies or others who do not know much about directx betas so that they would not be in the dark. Information is power and isn't that what this board is all about, helping each other out with information and thereby giving each other the power to control, utilize and improve our computer and the systems within?