Date.prototype.format = function(format){                   var o = {               "M+" : this.getMonth()+1, //month               "d+" : this.getDate(), //day               "h+" : this.getHours(), //hour               "m+" : this.getMinutes(), //minute               "s+" : this.getSeconds(), //second               "q+" : Math.floor((this.getMonth()+3)/3), //quarter               "S" : this.getMilliseconds() //millisecond               }                    if(/(y+)/.test(format)) {                   format = format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));               }                    for(var k in o) {                   if(new RegExp("("+ k +")").test(format)) {                       format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length));                  }               }                   return format;               }           }       //how to use  new Date().format('yyyy-MM-dd hh:mm:ss');