I might suggest that technically it commences at midnight, but that the definition falls consistent with another solution below that implies it's depending on how we experience over it. BVernon "Working day and night time" is much more ambiguous if the "time" is intended to get tightly bound to "night" https://gregorynyhpw.p2blogs.com/36481718/helping-the-others-realize-the-advantages-of-night-gangnam-퍼펙트가라오케-karaoke-guide