public Period getPeriod() {
        return Period.between(
                LocalDate.ofInstant(from, ZoneOffset.UTC),
                LocalDate.ofInstant(to, ZoneOffset.UTC));
    }
@return The {@link Period} of this {@link TimePeriod} in terms of the UTC time zone.
stroom-util/src/main/java/stroom/util/time/TimePeriod.java