export const extractDateRangeFromPosts = (posts: Post[], granularity: moment.unitOfTime.Base): { dateStart: Date, dateEnd: Date } => {
  const start: string = (_.sortBy(posts, 'created_time')[0] || {}).created_time;
  const end: string = (_.sortBy(posts, 'created_time').reverse()[0] || {}).created_time;
  const startOf = moment(start).startOf(granularity);
  const endOf = moment(end).endOf(granularity);