code: public function setDateTime($year, $month, $day, $hour, $min, $sec)
      {
          return $this->setDate($year, $month, $day)->setTime($hour, $min, $sec);
      }
docs: Sets the date and time of this instance
  
  @param  int   $year  Year
  @param  int   $month Month
  @param  int   $day   Day
  @param  int   $hour  Hour
  @param  int   $min   Minute
  @param  float $sec   Second
  
  @return static