I think but not entirely sure but a 10 hr drive on a Sunday night will count for whatever day you do the most driving in, so if you drove 4 hrs on Sunday before midnight but after midnight on the Monday you drove the remaining 6 hrs then the 10 hr drive would count for the Monday, but like I said not sure .
Or actually it might also count for the day the drive started on so in your case a Sunday .
Actually ignore all the above I’m more confident it’s on the day that you extend past the 9 hr mark so in your case it’ll be the Monday.
I won’t edit this waffling out but I’m confident on the last statement being correct.