it is possible to make "last activity" in show groups?

[YISRAEL]

Hey guys,
last night i build a new programed showgroups for me, now i want to put in it the option:
last activity: (date and time) or just date i have been trying that: last activity: $userinfo[lastactivity]
and that $user[lastactivity] - that was working but it gave me numbers that i dont understand like: 0189785578..
so.. im thinking of how to do this and nothing appears to me... it is possible to do it?... how??
-----Screen shot of the show groups. -----
screen shot of my show groups, its in hebrew so i edited it to english:


--------------------------------------------------------
Any ideas please?

--------------- Added [DATE]1263547477[/DATE] at [TIME]1263547477[/TIME] ---------------

1 day have been passed,
Well hellow guys...
i figured it out by myself...
it is possible. if u want the code send me private messeage please
thanks.