Swat/SwatDate.php
public function subtractHours($hours)
    {
        $hours = (int) $hours;
        $hours = -$hours;
        return $this->addHours($hours);
    }
public function subtractHours($hours)
    {
        $hours = (int) $hours;
        $hours = -$hours;
        return $this->addHours($hours);
    }
public function subtractHours ( $ hours ) { $ hours = ( int ) $ hours ; $ hours = - $ hours ; return $ this -> addHours ( $ hours ) ; }
Subtracts the specified number of hours from this date

@param integer $hours the number of hours to subtract.

@return this object on success or false on failure.
Subtracts the specified number of hours from this date