YOU SAID:

I'm not feeling up to it today.

INTO JAPANESE

今日はそれに気づいていません。

BACK INTO ENGLISH

I have not noticed it today.

INTO JAPANESE

私は今日それに気付かなかった。

BACK INTO ENGLISH

I did not notice it today.

INTO JAPANESE

私は今日それに気付かなかった。

BACK INTO ENGLISH

I did not notice it today.