YOU SAID:

I eat pizza at twelve

INTO JAPANESE

私は十二時にピザを食べます

BACK INTO ENGLISH

I eat pizza at twelve o'clock

INTO JAPANESE

12時にピザを食べます

BACK INTO ENGLISH

I eat pizza at 12:00

INTO JAPANESE

12:00にピザを食べます

BACK INTO ENGLISH

eat pizza at 12:00

INTO JAPANESE

12:00にピザを食べる

BACK INTO ENGLISH

eat pizza at 12:00