sure. in 5.0, its all theme driven… so you need to edit your sp theme you are using…and as always, we strongly recommend that you make your own theme and not edit one of ours (ref: http://codex.simple-press.com/codex/themes/theme-basics/creating-a-theme/)
you have the right function for the user date… now just set the options the way you want… the available args and defaults are:
‘nicedate’ => 0,
‘date’ => 1,
‘time’ => 1,
‘stackdate’ => 1,
nice date prints out stuff like 1 minute ago, 2 days ago… if nicedate is off, you get a timestamp… the date and time controls how much data in that timestamp… stackdate tells whether to stack, ie 2 lines, or not to stack, one line…
we hope to soon get all this type info in the codex on the template tags… just with the launch of 5.0, time has been short…