Date.prototype.format = function(fmt){
var o = {
"M+" : this.getMonth()+1,
"d+" : this.getDate(),
"h+" : this.getHours(),
"m+" : this.getMinutes(),
"s+" : this.getSeconds(),
"q+" : Math.floor((this.getMonth()+3)/3),
"S" : this.getMilliseconds()
};
if(/(y+)/.test(fmt)){
fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));
}
for(var k in o){
if(new RegExp("("+ k +")").test(fmt)){
fmt = fmt.replace(
RegExp.$1, (RegExp.$1.length==1)
? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
}
}
return fmt;
}
Date.prototype.addMonths = function (m) {
if(isNaN(m))m = 1;
var d = this.getDate();
this.setMonth(this.getMonth() + m);
if (this.getDate() < d)
this.setDate(0);
return this;
};
Date.prototype.addDays = function (d) {
if(isNaN(d))d = 1;
this.setDate(this.getDate() + d);
return this;
};
var nowStr = new Date().addMonths().format("yyyy-MM-dd hh:mm:ss");
console.log(nowStr);