What does that have to do with time? He warped a spatial attack with intense gravity. Gravity bending space is just kinda how strong gravity works. Like Black Holes.
Anyway. Back on topic. I'll concede on Yami and Law's Spatial cutting not being comparable. Not because I accept that Law's is stronger, it seems like the mere fact that Law overcame someone's resistance while Yami hasn't will just keep coming up, despite Yami having done more impressive things with his. Like cutting through pocket dimensions affecting other realities(At least so far, that's all he's done). And since Mihawk is Yonko level (Hell, he seems to be the strongest OP character on this site given his streak), that means Yami has no real win con, and I already have been considering changing to a different opponent for Yami, just can't think of who yet.. SO;
Mihawk has: Superior AP, Resistance to Yami's only kill option
Yami has: Superior range and mobility, but that won't really help