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I'm trying to book a ticket online with United Airlines and it keeps asking to enter a valid date of birth.
I have tried all combinations but it won't take it, i.e m/d/y
Try something with the following format: mm/dd/yyyy
Such as 10/30/1981 for 30th of October 1981.
If it still does not work, try again with different browsers, in this order:
Required, but never shown