either build a Waveform (using the Build Waveform VIs) and supply the initial time, and delta T. Or use the waveform Graph, and a bundle to supply the array of data with a initial time, and the delta T.
LabVIEW ships with an example called Waveform Graph that illustrates the various ways to transform the data that is shown on the graph. The middle graphs show what you are looking for. Also, the LabVIEW help (which is excellent!) describes what you need to do in great detail. Just look for Waveform Graphs.
