anyone know how to get the date/time into the modeline?

I think you can just add (display-time-mode 1) to dotspacemaces/user-config

There's probably a way to define a custom segment and integrate it into spaceline, but the above seems to work just fine and is a lot less work.

@alandipert: there's some info on customizing the format at https://www.emacswiki.org/emacs/DisplayTime

@codonnell: thanks! works a charm.