This love gets stronger and stronger with each passing day.

这种爱随着每一天的过去，变得越来越强烈了。

youdao

I love him more with each passing day.

随着时间的流逝，我越发爱他了。

《牛津词典》

Output has increased with each passing day.

产量与日俱增。

《新英汉大辞典》

But the economy was in ruins, falling faster with each passing day of the crisis that grew into the Great Depression.

VOA: special.2011.03.10

The making of weapons of mass destruction grows increasingly difficult to counter with each passing day.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Case Against Saddam (II): Serial and Material Breaches of International Commitments

But it does mean that business as usual is increasingly unfeasible with each passing day.

FORBES: Gazprom Isn't Being Run By Evil Geniuses, It's Being Run By The Keystone Cops

With each passing day, and each passing week it becomes harder for Syrians to endure.

CNN: U.N. agencies: Stop the suffering in Syria