Date.prototype.DateFormat = function (fmt) {
fmt = fmt || "yyyy-MM-dd";
const 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.$1.length));
}
for (const k in o) {
if (new RegExp(`(${k})`).test(fmt)) {
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : ((`00${o[k]}`).substr((`${o[k]}`).length)));
}
}
return fmt;
};