YOU SAID:
hi, how was your day today?
INTO JAPANESE
こんにちは、今日はどうだった?
BACK INTO ENGLISH
Hello, How was your day?
INTO JAPANESE
こんにちは、今日はどうでしたか?
BACK INTO ENGLISH
Hi, how it was today?
INTO JAPANESE
こんにちは、今日はどうでしたか?
BACK INTO ENGLISH
Hi, how it was today?
That didn't even make that much sense in English.