Add a time command to data

* Since we're logging in zulu time, add a convenient tool to the `data` command to output the date in that format.
* Remove triple level verbosity from this command line tool. Run quiet or debug.

AfC
That's a good question. I found it more confusing to have the same constraint in multiple places; keeping them in sync was a pain and once seemed enough. Perhaps it should be ditto'd each place, but one seemed enough for the constraint solver.