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Replacement for in ROS2?

In ROS1 if I wanted to publish an Odometry msg I would use to get the current time and publish the odom msg using that time. However, I haven't been able to find anything similar in ROS2? Does anyone know what functionality I can use to get the time for a msg I am publishing in ROS2?

now =
odom = Odometry()
odom.header.frame_id = self._odom_frame
odom.header.stamp = now