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    #1

    They were born on the same day/date.

    1. They were born on the same day.
    2. They were born on the same date.
    #1 means they have the same birthday.
    #2 means they have the same birth date.
    Do native speakers agree?
    I need native speakers' help.

  1. Raymott's Avatar
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    #2

    Re: They were born on the same day/date.

    They both mean they have the same birthday.
    But they are both ambiguous about whether the speaker intends to say that they are the same age as well. It depends on whether 'birth date' includes the year. The term has no fixed usage that I'm aware of.
    You can avoid misunderstandings by saying something like, "They were born on the same date in the same year" or "They have the same birthday, but X is a bit older."

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    #3

    Re: They were born on the same day/date.

    Does the phrase date of birth include the year?
    I need native speakers' help.

  2. Raymott's Avatar
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    #4

    Re: They were born on the same day/date.

    Quote Originally Posted by sitifan View Post
    Does the phrase date of birth include the year?
    Yes, in most contexts it would. 'Date of birth', or D.O.B on a form, is the official term for asking for a full birth date, including year.
    If you ask "What's your birthday?" you can't be guaranteed of getting the year. "What's your date of birth?" should get you the year, unless the person doesn't want to tell you their age.

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    #5

    Re: They were born on the same day/date.

    Quote Originally Posted by Raymott View Post
    Yes, in most contexts it would. 'Date of birth', or D.O.B on a form, is the official term for asking for a full birth date, including year.
    If you ask "What's your birthday?" you can't be guaranteed of getting the year. "What's your date of birth?" should get you the year, unless the person doesn't want to tell you their age.
    What's your birthday?
    When is your birthday?
    The above two sentences are interchangeable, aren't they?
    I need native speakers' help.

  3. Skrej's Avatar
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    #6

    Re: They were born on the same day/date.

    Yes, but as Raymott mentioned, you're probably only going to get the month and day as an answer for either one.

    What's your birthday?
    It's May 7th.
    When is your birthday?
    It's Aug 13th.
    Wear short sleeves! Support your right to bare arms!

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    #7

    Re: They were born on the same day/date.

    Quote Originally Posted by Skrej View Post
    Yes, but as Raymott mentioned, you're probably only going to get the month and day as an answer for either one.

    What's your birthday?
    It's May 7th.
    When is your birthday?
    It's Aug 13th.
    A: When is your birthday?
    B: It's on Aug 13th.
    Is the above dialogue also correct?
    I need native speakers' help.

  4. Skrej's Avatar
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    #8

    Re: They were born on the same day/date.

    Quote Originally Posted by sitifan View Post
    A: When is your birthday?
    B: It's on Aug 13th.
    Is the above dialogue also correct?
    Yes, 'on' is correct but optional.

    Edit: Colloquially, I might just reply with the date, and not even include 'It's (on)'.

    When's your birthday?
    January 15th.
    Wear short sleeves! Support your right to bare arms!

  5. Raymott's Avatar
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    #9

    Re: They were born on the same day/date.

    I don't use 'on'. The date is your birthday/date. It doesn't happen on that date, like other things that might happen on that date. Similar with anniversary, national day.
    (You can use 'on', but it's not logically necessary.)

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