What is the date today? / What day is it today?
Today is the _(date)_ of _(month)_. / Today is _(day)_. (Monday / Tuesday / Wednesday etc.)
What will be the date tomorrow? / What day will be tomorrow?
Tomorrow will be the _(date)_ of _(month)_. / Tomorrow will be _(day)_. (Monday / Tuesday / Wednesday etc.)
What was the date yesterday? / What day was yesterday?
Yesterday was the _(date)_ of _(month)_. / Yesterday was _(day)_. (Monday / Tuesday / Wednesday etc.)