@Override
    public String toString() {
        return "EffectiveMeta{" +
                feedName + ":" +
                typeName + ":" +
                id +
                ", effectiveTime=" + DateUtil.createNormalDateTimeString(effectiveMs) +
                '}';
    }
Only to be used as a threshold in {@link NavigableSet#floor(Object)} navigation
where we only care about the effectiveMs.
stroom-meta/stroom-meta-api/src/main/java/stroom/meta/api/EffectiveMeta.java