らいにち来日rainichi
1.

The act of a foreigner traveling to Japan for any purpose, including tourism, business, or research.

2.

A future date when someone is scheduled to arrive in Japan.

3.

The occasion on which international visitors come to Japan, often associated with events or significant engagements.

Example:

ボブがいつ来日したか分からない。

らいじつ来日raijitsu
1.

The act of a foreign individual arriving in Japan, often for purposes such as work, tourism, or cultural exchange.

2.

A noteworthy event or occasion when a non-Japanese person visits Japan, often for a specific purpose such as a performance or official engagement.

3.

A term indicating the future arrival of a foreigner in Japan, suggesting plans or expectations for their visit.