The phrase "called day" is often used to refer to the daytime or the period of the day when the sun is up. There are several antonyms for this phrase that can be used to describe different times of the day or other situations. One opposite of "called day" is "called night," which refers to the period of the day when the sun has set and it is dark outside. Other antonyms include terms like "called evening," "called morning," or "called twilight." Depending on the context, other antonyms could include words like "called dusk" or "called dawn." Overall, there are many different words that can be used to describe different times of day and the various states of light and darkness.