public function __construct(DateTime $lower = null, DateTime $upper = null, $lowerInclusive = true, $upperInclusive = false)
{
if (null !== $lower && null !== $upper && $lower > $upper) {
throw new InvalidArgumentException("Range lower bound must be less than or equal to range upper bound");
}
parent::__construct($lower, $upper, $lowerInclusive, $upperInclusive);
}
