There is no Spinner or Calendar controls for SWT. There is an article on writing your own SWT widgets on eclipse.org. I believe there is even an example on how to create your own Spinner control. I would search on eclipse.org for this article and go from there.
I also ran across this in case you want something very specific to your needs. I wonder why JFace doesn't have a component yet. However, technically, core Swing doesn't have one yet either which is pretty pathetic.