function sequence(number) { return Array.apply(null, {length: number}).map(Function.call, Number);};

const begin = moment("2018.05.05", "YYYY.MM.DD");
const today = moment();
const daysCount = moment().diff(begin, "days");

const days = sequence(daysCount + 1).map((dayNo) => {
  return moment(today).subtract(dayNo, "days").format("YYYY.MM.DD");
})