public void setCreatedAt(java.util.Date createdAt) {
        this.createdAt = createdAt;
    }
<p>
When the network function instance was created.
</p>

@param createdAt
       When the network function instance was created.
aws-java-sdk-tnb/src/main/java/com/amazonaws/services/tnb/model/ListSolFunctionInstanceMetadata.java