I use that as our first feeding of the day because my baby sleeps 5+ hours (a full night of sleep for a newborn) before that feed. After that feeding, she goes back to sleep for another 3 hours and then starts our day, so I COULD count it as the night before, but it wouldn't look good in our schedule that way. My baby's feeds for the day are - 5am, 8am, 11am, 2pm, 5pm, 8pm, 11pm. If your baby has made a schedule for themselves, what does it look like? Where does the feeding fit in the schedule? Does it make a difference, or could you just count it as whatever you felt like, and it wouldn't really matter?
My favorite site for baby sleep considers it a night feeding. Here's a link -
https://www.babysleepsite.com/tag/newborn-schedule/