YOU SAID:

There once was a word for day after tomorrow

INTO JAPANESE

かつて、明後日の言葉があった

BACK INTO ENGLISH

There used to be the day after tomorrow

INTO JAPANESE

以前は明日の翌日だった

BACK INTO ENGLISH

Previously it was the next day tomorrow

INTO JAPANESE

以前は明日の翌日でした

BACK INTO ENGLISH

Previously it was the next day tomorrow