How To: Get the Scene Time
Cycles 4D does not have a 'Time' node which returns the current scene time in frames or seconds. However, it is very easy to create one using the input Value node. Here's how to do it.
Use the Value node to return the time
It's very simple: add a Value node to the scene and keyframe the value to range from the start frame to the total number of frames in the scene. Now on each frame the node will output the current frame.
For the time in seconds, just keyframe from the start time to the end time and now the node will output the current time in seconds.