Asking what day is today

Hello, everyone:

I have some expressions about asking for date. Please see if there are any of them that are inappropriate. Thank you!

Q1: What day is it?

A1: It is Sunday.

Q2: What day is today?

A2: Today is Sunday.

Q3: What day is it today?

A3: It is Sunday today.

Q4: Is today Thursday?

A4: Yes, it is.

Q4: Isn't it Sunday today?

A4: Yes, it is.

Yes, it is Sunday today .

Q4: Isn't today Sunday?

A4: Yes, it is.

Q4: Is it your birthday today?

A4: Yes, it is.

Q4: Is today your birthday?

A4: Yes, it is.

Q4: Is your birthday today?

A4: Yes, it is my birthday today.

--------------------------------------------