YOU SAID:

I ate my dog for breakfast at 12 am.

INTO JAPANESE

私は午前12時に朝食に犬を食べました。

BACK INTO ENGLISH

I ate my dog for breakfast at 12:00 am.

INTO JAPANESE

私は午前12時に朝食に犬を食べました。

BACK INTO ENGLISH

I ate my dog for breakfast at 12:00 am.