If I land at 'night' (i.e. I think it's dark) then I log it as night. If I depart at night but land in daylight I log it as 'Day'. I do just scheduled shorthaul EU Ops so the numbers should even out oer time. Can't see that principle working for longhaul or ops with lots of night flying.
If you are flying on an IR, I don't think anyone really cares whether it's night or day anyway.