My guild window doesn't allow sorting by last time logged in.
The only categories are Name, Level, Class, Location, Guild Rank and Member Note.
EDIT: And for the "biodrones" who are defending this- you are the ones that have no clue how fundamental number sorting is in programming...
Why do you think, when sorting guild members by level, you see something like this:
19
1
29
2
30
36
3
47
4
etc
I can't believe this actually made it past beta... /facepalm