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There is no such word as "birthdate." It's either "date of birth" or "birthday."
good question... it seems to be "date of birth" , but i'm not sure because i'm not native english speaker.
Is that really so?
Many sites use birthdate as well??
some online dictionaries include it. Personally, I agree with you.
Um, wrong. Birthdate is the date you were born. Date of birth is another way of saying that. Birthday implies the day and month you were born on but says nothing about which year.