YOU SAID:
I had had a good time until I will have had a terrible time
INTO JAPANESE
私はひどい時間を過ごしていたであろうまで楽しい時間を過ごした
BACK INTO ENGLISH
I had a good time until I would have had a terrible time
INTO JAPANESE
私はひどい時間を過ごしていたであろうまで楽しい時間を過ごした
BACK INTO ENGLISH
I had a good time until I would have had a terrible time
Come on, you can do better than that.