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