Dear student,

You must mention the examination name that for which examination you want to know the dates. Because in 2021 there will be many exams like neet, jee mains, jee advanced or BITSAT, comedk, etc.
Because and I cannot assume any exam by myself and tell you about the 2021 dates. It is possible that some of the exams have declared their dates and some or not.

So you must mention the particular examination name so that we can help you in best possible way.