public GetCoreDefinitionVersionResult withCreationTimestamp(String creationTimestamp) {
        setCreationTimestamp(creationTimestamp);
        return this;
    }
The time, in milliseconds since the epoch, when the core definition version was created.

@param creationTimestamp
       The time, in milliseconds since the epoch, when the core definition version was created.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-greengrass/src/main/java/com/amazonaws/services/greengrass/model/GetCoreDefinitionVersionResult.java