YOU SAID:
I have a fantastic time
INTO JAPANESE
私は素晴らしい時間を持っています。
BACK INTO ENGLISH
I have a great time.
INTO JAPANESE
素晴らしい時間があります。
BACK INTO ENGLISH
Have a great time.
INTO JAPANESE
素晴らしい時間を過ごします。
BACK INTO ENGLISH
Spend a great time.
INTO JAPANESE
素晴らしい時間を過ごします。
BACK INTO ENGLISH
Spend a great time.
That didn't even make that much sense in English.