function get_first_date_last_month($m=1) {
    return $this->mdate($this->dateFormat, mktime(0, 0, 0, $this->mdate("m")-$m, 1, $this->mdate("Y")));
  }
function get_first_date_last_month($m=1) {
    return $this->mdate($this->dateFormat, mktime(0, 0, 0, $this->mdate("m")-$m, 1, $this->mdate("Y")));
  }
function get_first_date_last_month ( $ m = 1 ) { return $ this -> mdate ( $ this -> dateFormat , mktime ( 0 , 0 , 0 , $ this -> mdate ( "m" ) - $ m , 1 , $ this -> mdate ( "Y" ) ) ) ; }
Return first date of last month
Return first date of last month