YOU SAID:
He has a date with Mary this afternoon.
INTO JAPANESE
彼はメアリーと今日の午後デートをする。
BACK INTO ENGLISH
He has a date with Mary this afternoon.
INTO JAPANESE
彼はメアリーと今日の午後デートをする。
BACK INTO ENGLISH
He has a date with Mary this afternoon.
That didn't even make that much sense in English.