Elastica\Aggregation\DateHistogram::setExtendedBounds PHP Method

    public function setExtendedBounds($min = '', $max = '')
    {
        $bounds = [];
        $bounds['min'] = $min;
        $bounds['max'] = $max;
        // switch if min is higher then max
        if (strtotime($min) > strtotime($max)) {
            $bounds['min'] = $max;
            $bounds['max'] = $min;
        }
        return $this->setParam('extended_bounds', $bounds);
    }