/* */ 
var DateProto = Date.prototype,
    INVALID_DATE = 'Invalid Date',
    TO_STRING = 'toString',
    $toString = DateProto[TO_STRING];
if (new Date(NaN) + '' != INVALID_DATE) {
  require('./$.redefine')(DateProto, TO_STRING, function toString() {
    var value = +this;
    return value === value ? $toString.call(this) : INVALID_DATE;
  });
}
