I would doubt it. Firstly, those terms are outdated and archaeic. They were included in the law because they generally refer to a knife that has no utilitarian purpose; the knife is inteneded as a weapon and only a weapon. There are still of course modern knives that might be considered a "dagger or stilletto", but these will have double edges (or at the least, a well defined false edge) or resemble the old "weapons". For example, I might be apprehensive about carrying a Cold Steel Ti-Lite in such a state, but wouldn't worry about the ATR. The ATR has neither a double edge, nor the classic lines of a dagger or stilletto.
This is just my opinion, and my interpretation of the laws and descriptions.