YOU SAID:

today was going to be the day that i was going to throw it back to you

INTO JAPANESE

今日はあなたにそれを投げ返すつもりだった日になるだろう

BACK INTO ENGLISH

Today will be the day I was going to throw it back to you

INTO JAPANESE

今日はあなたにそれを投げ返すつもりだった日になります

BACK INTO ENGLISH

Today is the day I was going to throw it back to you

INTO JAPANESE

今日は私があなたにそれを投げ返すつもりだった日です

BACK INTO ENGLISH

Today is the day I was going to throw it back to you