public String getModificationTime() {
        return this.modificationTime;
    }
<p>
The date and time that the rule group was last modified, in Unix time format and Coordinated Universal Time
(UTC).
</p>

@return The date and time that the rule group was last modified, in Unix time format and Coordinated Universal
        Time (UTC).
aws-java-sdk-route53resolver/src/main/java/com/amazonaws/services/route53resolver/model/FirewallRuleGroup.java