白昼

daytime, daylight

noun Rare #31,833
daytime, daylight Somewhat formal; 白天 is more common in everyday speech.
CH: 夏天的白昼很长。
EN: The days are long in summer.

春天白昼变长了。

The days get longer in spring.

黑夜又白昼

Night turns to day again.

— A Sun (2019)

如白昼般

Like daylight

— 蝙蝠 (2009)