YOU SAID:

I start work in five days.

INTO JAPANESE

私は5日で仕事を始めます。

BACK INTO ENGLISH

I will start work in 5 days.

INTO JAPANESE

私は5日後に仕事を始めます。

BACK INTO ENGLISH

I will start work five days later.

INTO JAPANESE

私は5日後に仕事を始めます。

BACK INTO ENGLISH

I will start work five days later.