YOU SAID:
this is going to be the best day of my life
INTO JAPANESE
今日は人生で最高の日になるだろう
BACK INTO ENGLISH
today will be the best day of my life
INTO JAPANESE
今日は私の人生で最高の日になるでしょう
BACK INTO ENGLISH
today will be the best day of my life
Come on, you can do better than that.