function adjustForDST({ min, max, localizer }) {
  if (localizer.getTimezoneOffset(min) !== localizer.getTimezoneOffset(max)) {
    return {
      start: localizer.add(min, -1, 'day'),
      end: localizer.add(max, -1, 'day'),
    }
  }
  return { start: min, end: max }
}
Since the TimeGutter only displays the 'times' of slots in a day, and is separate
from the Day Columns themselves, we check to see if the range contains an offset difference
and, if so, change the beginning and end 'date' by a day to properly display the slots times
used.