Now (UTC) is used for getting the current Coordinated Universal Time (UTC), which is a standard time basis around the world, with every timezone being a relative offset of UTC.
The result is in Unix Time, which is the number of milliseconds since the Unix Epoch (1st January 1970). This of course isn't of much use on its own, and is therefore used in conjuction with other DateTime Nodes.
Pulse Input (►)
A standard Input Pulse, to trigger the execution of the Node.
The offset from the current UTC in milliseconds.
Pulse Output (►)
A standard Output Pulse, to move onto the next Node along the Logic Branch, once this Node has finished its execution.
The current UTC, with the offset (if any) applied.