YOU SAID:

I once had a good day, but today is not that great

INTO JAPANESE

私はかつて良い一日を過ごしましたが、今日はそれほど素晴らしいではありません

BACK INTO ENGLISH

I once had a good day but today is not so great

INTO JAPANESE

私はかつて良い一日を過ごしましたが、今日はそれほど素晴らしいではありません

BACK INTO ENGLISH

I once had a good day but today is not so great