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daytime; broad daylight
「日中」 has another reading with different meanings.
daytime; during the day
日中にっちゅうは仕事しごとで忙しくいそがしくしている。
I'm busy with work during the day.
日中にっちゅうの気温きおんが上がっあがってきて暑いあつい。
The daytime temperature has risen.
日中にっちゅうに電話でんわをかけ直しなおしますのでお待ちまちください。
I'll call you back during the day.