public void setDefinitionTimestamp(java.util.Date definitionTimestamp) {
        this.definitionTimestamp = definitionTimestamp;
    }
<p>
The time that the resource definition was retrieved.
</p>

@param definitionTimestamp
       The time that the resource definition was retrieved.
aws-java-sdk-networkmanager/src/main/java/com/amazonaws/services/networkmanager/model/NetworkResource.java