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⤷ Check the validity of dates

Use StrToDate function and try ... except construction:

procedure TForm1.Button1Click(Sender: TObject);
begin
  try
    StrToDate(MaskEdit1.Text);
    Label2.Caption:='Valid Date';
  except
    on EConvertError do Label2.Caption:='Not Valid Date';
  end;
end;
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