Starting during daylight hours and continuing until after dark.

(film) A cinematographic technique in which a crew films in a high-contrast situation, typically in the early morning or late afternoon, with a blue filter, causing the scene to look as if it were shot in moonlight.

(cinematography) In the daytime, with a blue filter, causing the scene to look as if it were shot in moonlight.

All the time; round the clock; unceasingly.

Synonym of chalk and cheese (“two things that are very different”)

(idiomatic) At any time; 24/7