YOU SAID:
work is the hardest part of the day
INTO JAPANESE
仕事は日の最も困難な部分
BACK INTO ENGLISH
Work is the hardest part of the day.
INTO JAPANESE
仕事は、今日の最も困難な部分です。
BACK INTO ENGLISH
Work is the most difficult part of today.
INTO JAPANESE
仕事は、今日の最も困難な部分です。
BACK INTO ENGLISH
Work is the most difficult part of today.
That didn't even make that much sense in English.