现在是15点30分。用英语怎么说？

现在是15点30分。

It's fifteen thirty hours.

fifteen

n. 十五，十五个人组成的橄榄球队；

例句
The fifteen accused, young men from different parts of England, denied the charges.
被告是15名来自英格兰各地的年轻男子，他们对指控矢口否认。

thirty

n. 三十，三十个，三十年代，三十的记号；adj. 三十的，三十个的；num. 三十，三十个；

例句
I saw a man in a blue jacket thirty metres ahead of me...
我看见在我前面30米处有一个身穿蓝色夹克的男人。

hours

n. 小时( hour的名词复数 )，固定时间，一小时的时间或行程，重要时刻；

例句
The workforce have recently been calling for their working hours to be reduced. Many companies have accordingly switched to a five-day week.
工人们最近一直在呼吁缩短工作时间。许多公司于是转成了一周五天工作制。