src/Date.php
private function getDaysInMonth(Month $month, Year $year)
    {
        return (int)date('t', mktime(0, 0, 0, (string)$month, 1, (string)$year));
    }
private function getDaysInMonth(Month $month, Year $year)
    {
        return (int)date('t', mktime(0, 0, 0, (string)$month, 1, (string)$year));
    }
private function getDaysInMonth ( Month $ month , Year $ year ) { return ( int ) date ( 't' , mktime ( 0 , 0 , 0 , ( string ) $ month , 1 , ( string ) $ year ) ) ; }
Get number of days in specified month.

@access private
@param  Month $month
@param  Year  $year
@return int
Get number of days in specified month .