Forgot birthday for answer security question

I have found my old iphone 5 with my old icloud. I remember the passcode but the icloud was already blocked and I also forgot the password although I remember the ID. So I have tried iforgot to get a new icloud password and I have noted down my security answers. But once again I forgot my applied birthday that I used to sign for. Please help via this ID or email me:

Thanks a lot

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