I’m pretty sure it just splits the calories and workout minutes according to what day they were done on. Eg if you run from 23:45 to 00:15, you’d log 15 exercise minutes in each day along with the corresponding number of calories.
I've checked on few of my late workouts, they are all listed on the starting day. However, the time spent on the ending day was always shorter than the one on the starting day, for all of these workouts. May be it is listed on the day that has the longer duration, but I'm not sure.
I've checked on few of my late workouts, they are all listed on the starting day. However, the time spent on the ending day was always shorter than the one on the starting day, for all of these workouts. May be it is listed on the day that has the longer duration, but I'm not sure.
I'm with @boss.king on this one. PM data counts toward previous day, post-midnight data counts toward next/current day.
Looking at the raw data written to Health, it points to time when Watch recorded the data point. In the case of Active Energy, Watch is saving/timestamping data every couple of seconds when in Workout mode vs about once every minute when not active. Which is reflecting in Fitness for Move.