I've always logged the night part in the 'Night' column and the remainder in the 'Day', so from the previous example, 0:30 and 0:30 in each
like this .
More of a conundrum to me has always been 'when does night start when en-route?' At sunset+30 at the point of departure? sunset +30 and the destination? We all know the illusion that altitude delays the sun setting, so should it be sunset (+30?) at the cruise altitude (and how do you calculate this?) or at some other altitude? In theory it would be possible to take off in daylight, fly into darkness, climb back into daylight to continue back into darkness again. So many options, and so far I have more or less taken the mean of the departure & destination +30, but would appreciate if anyone can state the definitive rule