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