その日は必ずやってくる。

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

day; days; sun; sunshine; sunlight; case (esp. unfortunate); event

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

always; without exception; necessarily; certainly; without fail; positively; invariably

to come along; to come around; to turn up; to arrive at the present; to get where one is; to have been doing something (for a period of time)