SOURCE

function strToDate(date) {
  // var timeBound = str.replace(/-/g, "/");
  // var timeBoundSubstr = timeBound.substring(0, 19);
  // var dateBound = new Date(timeBoundSubstr);
  var dateBound = date;
  var GMT_bound = dateBound.getTimezoneOffset();
  var dateNum = dateBound.getTime();
  var connectionTimeB = dateNum - GMT_bound * 60000;
  var connectionDateB = new Date(connectionTimeB);
  var GMTtime = formatDateToStr(connectionDateB);
  return GMTtime;
}
function formatDateToStr(date) {
  var arr = [
    date.getFullYear(),
    "-",
    date.getMonth() + 1 <= 9 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1,
    "-",
    date.getDate() < 9 ? "0" + date.getDate() : date.getDate(),
    "-",
    date.getHours() < 9 ? "0" + date.getHours() : date.getHours(),
    "-",
    date.getMinutes() < 9 ? "0" + date.getMinutes() : date.getMinutes(),
    "-",
    date.getSeconds() < 9 ? "0" + date.getSeconds() : date.getSeconds(),
  ];
  return arr.join("");
}
//console.log(new Date(2017,11,30,11,30,20))
console.log(strToDate(new Date()))