sS formatDateRangeWithMinutes(LongRange range) {
  ret formatDateRangeWithMinutes(range, localTimeZone());
}

sS formatDateRangeWithMinutes(LongRange range, TimeZone tz, S separator default " to ") {
  ret range == null ? null
    : formatDateWithMinutes(range.start, tz) + separator + formatDateWithMinutes(range.end, tz);
}