Hi Vitalii,
Go to protected/models/X2Model.php then find "$pickerOptions" under "case 'date':" and add "'yearRange' => '-100:+100'," to the array so it looks like.
$pickerOptions = array(// jquery options
'dateFormat' => Formatter::formatDatePicker(),
'changeMonth' => false,
'changeYear' => true,
'yearRange' => '-100:+100',
);
This will allow you to pick 100 years into the future or past.
-Jack