utils.js

import moment from 'moment';

function fixedZero(val) {
  return val * 1 < 10 ? `0${val}` : val;
}

function getTimeDistance(type) {
  const now = new Date();
  const oneDay = 1000 * 60 * 60 * 24;

  if (type === 'today') {
    now.setHours(0);
    now.setMinutes(0);
    now.setSeconds(0);
    return [moment(now), moment(now.getTime() + (oneDay - 1000))];
  }

  if (type === 'week') {
    let day = now.getDay();
    now.setHours(0);
    now.setMinutes(0);
    now.setSeconds(0);

    if (day === 0) {
      day = 6;
    } else {
      day -= 1;
    }

    const beginTime = now.getTime() - (day * oneDay);

    return [moment(beginTime), moment(beginTime + ((7 * oneDay) - 1000))];
  }

  if (type === 'month') {
    const year = now.getFullYear();
    const month = now.getMonth();
    const nextDate = moment(now).add(1, 'months');
    const nextYear = nextDate.year();
    const nextMonth = nextDate.month();

    return [moment(`${year}-${fixedZero(month + 1)}-01 00:00:00`), moment(new Date(`${nextYear}-${fixedZero(nextMonth + 1)}-01 00:00:00`).getTime() - 1000)];
  }

  if (type === 'year') {
    const year = now.getFullYear();

    return [moment(`${year}-01-01 00:00:00`), moment(`${year}-12-31 23:59:59`)];
  }
}

export default {
  fixedZero,
  getTimeDistance,
};