YOU SAID:
The day where I start, is the day where I begin to end.
INTO JAPANESE
私が開始する日は、私が終了し始める日です。
BACK INTO ENGLISH
The day I start is the day I start to end.
INTO JAPANESE
私が始める日は、私が終わり始める日です。
BACK INTO ENGLISH
The day I start is the day I start.
INTO JAPANESE
私が始める日は、私が始める日です。
BACK INTO ENGLISH
The day I start is the day I start.
That didn't even make that much sense in English.