Stack overflow asks for a input of YYYY/MM/DD, but it does not take my date, for example 1982/11/21 will get an error message asking for a YYYY/MM/DD input. I do not really care but it does look stupid :D.
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As stated up above the date format you entered is valid. The only way the site wouldn't accept it if you didn't typed it exactly as you said you did or because you have a white space somewhere (the date does not trim the spaces so if you have one it sees