YOU SAID:
what time was it yesterday?
INTO JAPANESE
昨日は何時でしたか。
BACK INTO ENGLISH
What was yesterday?
INTO JAPANESE
昨日はなんですか
BACK INTO ENGLISH
What is yesterday?
INTO JAPANESE
昨日とは何ですか。
BACK INTO ENGLISH
What was yesterday?
INTO JAPANESE
昨日はなんですか
BACK INTO ENGLISH
What is yesterday?
INTO JAPANESE
昨日とは何ですか。
it is unlikely that this phrase will ever reach equilibrium