js获取当前系统时间并格式化

Date.prototype.Format = function (fmt) {
  var o = {
    "M+": this.getMonth() + 1, //月份
    "d+": this.getDate(), //日
    "H+": this.getHours(), //小时
    "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;
};

使用

let time = new Date().Format("yyyy-MM-dd HH:mm:ss")

时间格式化

function getYMDHMS(timestamp) {
  let time = new Date(timestamp);
  let year = time.getFullYear();
  let month = time.getMonth() + 1;
  let date = time.getDate();
  let hours = time.getHours();
  let minute = time.getMinutes();
  let second = time.getSeconds();
  if (month < 10) {
    month = "0" + month;
  }
  if (date < 10) {
    date = "0" + date;
  }
  if (hours < 10) {
    hours = "0" + hours;
  }
  if (minute < 10) {
    minute = "0" + minute;
  }
  if (second < 10) {
    second = "0" + second;
  }
  return (
    year + "-" + month + "-" + date + " " + hours + ":" + minute + ":" + second
  );
}

使用

getYMDHMS (Date Fri Nov 27 2020 00:00:00 GMT+0800 (中国标准时间))