# builtin_interfaces A package containing message definitions for types defined in the OMG IDL Platform Specific Model. For more information about ROS 2 time, see [design.ros2.org](https://design.ros2.org/articles/clock_and_time.html). For more information about ROS 2 interfaces, see [docs.ros.org](https://docs.ros.org/en/rolling/Concepts/About-ROS-Interfaces.html). ## Messages (.msg) * [Duration](msg/Duration.msg): Describes a time duration composed of seconds and nanoseconds components. * [Time](msg/Time.msg): Describes a point in time, composed of seconds and nanoseconds components. ## Quality Declaration This package claims to be in the **Quality Level 1** category, see the [Quality Declaration](QUALITY_DECLARATION.md) for more details.