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// 對Date的擴充套件，將 Date 轉化為指定格式的String
// 月(M)、日(d)、小時(h)、分(m)、秒(s)、季度(q) 可以用 1-2 個佔位符，
// 年(y)可以用 1-4 個佔位符，毫秒(S)只能用 1 個佔位符(是 1-3 位的數字)
// 例子：
// (new Date()).format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423
// (new Date()).format("yyyy-M-d hⓜ️s.S")   ==> 2006-7-2 8:9:4.18
Date.prototype.format = function (fmt) {
  var o = {
    "M+": this.getMonth() + 1, //月份
    "d+": this.getDate(), //日
    "h+": this.getHours(), //小時
    "m+": this.getMinutes(), //分
    "s+": this.getSeconds(), //秒
    "q+": Math.floor((this.getMonth() + 3) / 3), //季度
    "S": this.getMilliseconds() //毫秒
  };
  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.addSeconds = function(seconds) {
  this.setSeconds(this.getSeconds() + seconds);
  return this;
}

Date.prototype.addMinutes = function(minutes) {
  this.setMinutes(this.getMinutes() + minutes);
  return this;
}

Date.prototype.addHours = function(hours) {
  this.setHours(this.getHours() + hours);
  return this;
}

Date.prototype.addDays = function(days) {
  this.setDate(this.getDate() + days);
  return this;
}

Date.prototype.addMonths = function(months) {
  this.setMonth(this.getMonth() + months);
  return this;
}

Date.prototype.addYears = function(years) {
  this.setFullYear(this.getFullYear() + years);
  return this;
}

function diffSeconds(milliseconds) {
  return Math.floor(milliseconds / 1000);
}

function diffMinutes(milliseconds) {
  return Math.floor(milliseconds / 1000 / 60);
}

function diffHours(milliseconds) {
  return Math.floor(milliseconds / 1000 / 60 / 60);
}

function diffDays(milliseconds) {
  return Math.floor(milliseconds / 1000 / 60 / 60 / 24);
}

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<script src="/js/DateFormat.js"></script>
<script>
  console.log((new Date()).Format("yyyy-MM-dd hh:mm:ss"));
</script>

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<script src="DateFormat.js"></script>
<script>
  // Now Time
  let now_d = new Date();
  // Specific Time
  var spe_d1 = new Date('August 19, 2018 23:15:30');
  var spe_d2 = new Date('2019-03-12 21:34:00');
  var spe_d3 = new Date('2019/03/12 21:34:00');
  var spe_d4 = new Date(1558947486000); // timestamp millisecond

  console.log([
    now_d.format("yyyy-MM-dd hh:mm:ss"),
    spe_d1.format("yyyy-MM-dd hh:mm:ss"),
    spe_d2.format("yyyy-MM-dd hh:mm:ss"),
    spe_d3.format("yyyy-MM-dd hh:mm:ss"),
    spe_d4.format("yyyy-MM-dd hh:mm:ss"),
  ]);

  // Add days
  console.log([
    now_d.addDays(1).format("yyyy-MM-dd hh:mm:ss"),
    now_d.addDays(-1).format("yyyy-MM-dd hh:mm:ss"),
  ]);

  // Add years
  console.log([
    now_d.addYears(3).format("yyyy-MM-dd hh:mm:ss"),
    now_d.addYears(-3).format("yyyy-MM-dd hh:mm:ss"),
  ]);

  // Date diff function
  console.log(diffSeconds(now_d - spe_d2));
  console.log(diffMinutes(now_d - spe_d2));
  console.log(diffHours(now_d - spe_d2));
  console.log(diffDays(now_d - spe_d2));
</script>

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// Add Days
console.log(new Date(now_d.setDate(now_d.getDate() + 3)).Format("yyyy-MM-dd hh:mm:ss"));