src/Peach/DT/Date.php
private function getMonthAdjuster()
    {
        static $adjuster = null;
        if (!isset($adjuster)) {
            $adjuster = new FieldAdjuster(self::$MONTH, self::$YEAR, 1, 12);
        }
        return $adjuster;
    }
private function getMonthAdjuster()
    {
        static $adjuster = null;
        if (!isset($adjuster)) {
            $adjuster = new FieldAdjuster(self::$MONTH, self::$YEAR, 1, 12);
        }
        return $adjuster;
    }
月の調整をするための FieldAdjuster を返します.

@return FieldAdjuster
@codeCoverageIgnore