YOU SAID:
I have eaten fifteen apples on a Sunday
INTO JAPANESE
私は日曜日に15個のりんごを食べました
BACK INTO ENGLISH
I ate 15 apples on Sunday
INTO JAPANESE
日曜日にりんごを15個食べました
BACK INTO ENGLISH
I ate 15 apples on Sunday
That didn't even make that much sense in English.