constructor.js

constructor.js

function createObject(constructor, argArray) {
    var args = [null].concat(argArray);
    var factoryFunction = constructor.bind.apply(constructor, args);
    return new factoryFunction();
}

function parseDate(dateStr) {
  var args = dateStr.split(/[^0-9]+/).map((number,index) => parseInt(number) - (index === 1 ? 1 : 0)));
  var dt = createObject(Date, args);
  return dt;
}

var date = parseDate('2021-01-01 01:01:01');