자바스크립트 yyyy-mm-dd 형식 -> yyyymmdd 형식으로 변경

var date_old_format = "2016-08-10";

var date_new_format = date_old_format.split("/").join("");

-> "20160810"

var date_old_format = "2016-08-10";

var date_new_format = date_old_format.split("/").reverse().join("");

-> "10082016"

출처 : [스텍오버플로우] http://stackoverflow.com/questions/19709793/convert-date-from-dd-mm-yyyy-to-yyyy-mm-dd-in-javascript