1、今天星期几用英语有以下2种表达：

（1）What day is today.

（2）What day is it today.

2、例句：

（1）今天星期几？今天星期五。

What day is today? It is Friday.

（2）能不能告诉我今天星期几？

Can you tell me what day it is today?

（3）我的朋友在哪儿？哦，今天星期几？

Where are my friends Well?What day is it today