src/Marando/AstroDate/Traits/FormatTrait.php
private function format_m(&$str) {
    if (strstr($str, '%m'))
      $str = str_replace('%m', sprintf('%02d', $this->month), $str);
  }
private function format_m(&$str) {
    if (strstr($str, '%m'))
      $str = str_replace('%m', sprintf('%02d', $this->month), $str);
  }
Numeric representation of a month, with leading zeros
@param type $str