daytime; during the day
Japan and China; Japanese-Chinese; Sino-Japanese
「日中」 has another reading with different meanings.
daytime; broad daylight
日中は暑くて外に出られない。
It's so hot during the day I can't go outside.
彼は毎日日中ずっと忙しく働いている。
He works all day long.
日中は会社にいることが多い。
I'm often at the company during the day.