"Why are you doing the dishes? It is night!"
Translation:Miksi sinä tiskaat? On yö!
The time of day, the weather, emotions, etc are not physical things that have the capability be something, nor possess something else, so therefore are not "it's," outside of English. Notice how they say that the clock possesses a certain time, and not "IT is [...] o'clock," as well. The clock is a thing (able to possess the time), but time isn't.