code: function dateShallowIncludesDate(date1, date2) {
    // First date is simple date
    if (date1.isDate) {
      if (date2.isDate) return date1.dateTime === date2.dateTime;
      if (!date2.startTime || !date2.endTime) return false;
      return (
        date1.dateTime === date2.startTime && date1.dateTime === date2.endTime
      );
    }
    // Second date is simple date and first is date range
    if (date2.isDate) {
      if (date1.start && date2.date < date1.start) return false;
      if (date1.end && date2.date > date1.end) return false;
      return true;
    }
    // Both dates are date ranges
    if (date1.start && (!date2.start || date2.start < date1.start)) return false;
    if (date1.end && (!date2.end || date2.end > date1.end)) return false;
    return true;
  }
docs: ======================================================== Determines if first date completely includes second date NOTE: This is a shallow test (no patterns tested)