what the date is today可以的.
有what day is it today , 没有 what day is today的.但是你问的是日期,what day is it today问的是星期几.有这么问,但是问题是不一样的.
不可以说what was it yesterday?因为问的是昨天天气怎么样.问怎么样的问句都是用how的.
有what is the weather like today?和how is the weather today?两句意思相同.但是没有what is the weather today?这么说的.
我是初三的.根据我的水平,我觉得是这样的.