dates.js

import moment from 'moment';

export class Dates {

  createDate(date) {
    let now = date ? new Date(date) : new Date();
    now.setHours(0,0,0,0);
    return now;
  }

  startAndEndOfWeek(date) {
    let now = this.createDate(date);
    let monday = moment(now).startOf('isoWeek').toDate();
    let sunday = moment(now).endOf('isoWeek').toDate();
    return [monday, sunday];
  }

  startAndEndOfMonth(date) {
    let now = this.createDate(date);
    let start = moment(now).startOf('month').toDate();
    let last = moment(now).endOf('month').toDate();
    return [start, last];
  }

  startAndEndOfYear(date) {
    let now = this.createDate(date);
    let start = moment(now).startOf('year').toDate();
    let last = moment(now).endOf('year').toDate();
    return [start, last];
  }

  addDay(date, days) {
    let now = this.createDate(date);
    return moment(now).add(days, 'day').toDate();
  }

  numberOfDaysInRange(range) {
    let start = moment(range[0]);
    let end = moment(range[1]);
    return end.diff(start, 'days') + 1;
  }
}