YOU SAID:

I can't believe this is happening on this very day.

INTO JAPANESE

私はこれがこの日起きているとは思わない。

BACK INTO ENGLISH

I do not think that this is happening this day.

INTO JAPANESE

私はこれが今日起こっているとは思わない。

BACK INTO ENGLISH

I do not think this is going on today.

INTO JAPANESE

私はこれが今日起こっているとは思わない。

BACK INTO ENGLISH

I do not think this is going on today.