YOU SAID:

I arrives in Tokyo today.

INTO JAPANESE

今日は東京に到着します。

BACK INTO ENGLISH

Today we are arriving in Tokyo.

INTO JAPANESE

今日は東京に到着しました。

BACK INTO ENGLISH

Today we have arrived in Tokyo.

INTO JAPANESE

今日、東京に到着しました。

BACK INTO ENGLISH

I arrived in Tokyo today.

INTO JAPANESE

今日東京に着きました。

BACK INTO ENGLISH

I arrived in Tokyo today.