private String getRuleInfo(final DataRetentionRule rule) {
        return String.join(" - ",
                rule.toString(),
                rule.getAgeString(),
                rule.getExpression().toString());
    }
Pkg private so we can test with a known now time
stroom-data/stroom-data-retention-impl/src/main/java/stroom/data/retention/impl/DataRetentionPolicyExecutor.java