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2- Birthday : is most often used in social contexts; i.e., when within this year is your birthday ? (perhaps referring to the social event it may imply to celebrate). So, considering the sample sentence in your question, it's inquiring the " birthday " "coming" implying the possiblity of a social interest (in addition to "I'm excited"). A. What's your birthday ? (What is your birthday ?) It is a question asking about the date you were born, and the answer would be, say, March 29, 1999. (Note: It is the same as "When was your birthday ?") B. When is your birthday ? It is a question asking about the anniversary day of birth, and the answer would be, say, March 29. I could say "My birthday is the eighth of August", or "My birthday is on the eighth of August", or "My birthday is August the eighth" or "My birthday is on August the eighth". All four are possible in BE and in Australia. Hi, guys, what's the difference between " birthday " and "birth date"? Is it a stupid question? In my opinion, all the people only have one birth date the whole life long, but everyone has a birthday every year.