Which is correct "What is your date of birth?" "What is the date of your birth?"

The first one is correct.( it's grammatically correct) The second one is also correct but ( it's logically , u can't write it to another page) ..... okey...... perhaps

Hi! I think you can ask: "When is your date of birth? " because when we ask about birthday we say WHEN is your birthday? and not WHAT

Both are correct.

i think, what is your date of birth?

I think, Both are correct. First is active. Second is passive.