Validating date of birth with jQuery

// jQuery Mask Plugin v1.14.3
// github.com/igorescobar/jQuery-Mask-Plugin
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var options =  {onKeyPress: function(data, e, field, options){
  console.log(data.length)
  
  var dia = data.split('/')[0],
      mes = data.split('/')[1];
  
  if(data.length >=2) {
    if(dia > 31) $('#data').val('31/');
  }
    
  if(data.length >=5) {
    if(mes > 12) $('#data').val(dia+'/12/');
  }

}};

$('#data').mask('00/00/0000', options);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><inputtype="text" id="data" name="teste">