what is today 的答语用it is monday,june the fourth对不对

不对，问题应改为What's the date today？或回答Today is Monday。日期的首字母要大写。

What day is it today?今天星期几？
Today is Monday.

What's the date today?今天几号？
Today is 22th Oct.

Today：今天
date：日期

See？明白不？