As the day darkened the streetlights came on.

天色渐暗，街灯亮了。

《柯林斯英汉双解大词典》

In the day when the keepers of the house shall tremble, and the strong men shall bow themselves, and the grinders cease because they are few, and those that look out of the Windows be darkened.

看守房屋的发颤，有力的屈身，推磨的稀少就止息，从窗户往外看的都昏暗。

youdao

One day, the sky suddenly darkened, and then came wind, thunder and rain. The real dragon flew to Ye Gong's home.

有一天，天空突然暗了下来，又是刮风，又是打雷，又是下雨，真龙飞到了叶公的家里。

youdao

On the day after he died, the lights of Broadway theaters darkened for a minute in honor of Arthur Miller.

VOA: special.2009.11.29

On September 11, 2001, a bright autumn day was darkened by the worst attack on the American people in our history.

WHITEHOUSE: The White House

It was nearly 10 years ago that a bright September day was darkened by the worst attack on the American people in our history.

WHITEHOUSE: President Obama on Death of Osama bin Laden

Ms. COLLINS: (Singing) As we go marching, marching in the beauty of the day, a million darkened kitchens, a thousand mill lofts gray, are touched with all the radiance as a sudden sun discloses, for the people hear us singing: bread and roses, bread and roses.

NPR: Judy Collins, From Both Sides Now