YOU SAID:

I'm having a really good time

INTO JAPANESE

私は本当に楽しい時間を過ごしています

BACK INTO ENGLISH

I have a really good time

INTO JAPANESE

私は本当に楽しい時間を過ごしました

BACK INTO ENGLISH

I had a really good time

INTO JAPANESE

とっても楽しかった

BACK INTO ENGLISH

I had a really good time.

INTO JAPANESE

とっても楽しかった

BACK INTO ENGLISH

I had a really good time.