Date.prototype.yyyymmdd = function() { var mm = this.getMonth() + 1; // getMonth() is zero-based var dd = this.getDate(); return [this.getFullYear(), (mm>9 ? '' : '0') + mm, (dd>9 ? '' : '0') + dd ].join(''); }; var date = new Date(); date.yyyymmdd(); 출처 : https://stackoverflow.com/questions/3066586/get-string-in-yyyymmdd-format-from-js-date-object