Do you want to know when did a person last join your server? Use this!
/seen:
cmd create seen Last seen
cmd edit seen 1 load %lseen%
cmd edit seen 2 if varset(%args%[1]) = %true% then goto 5
cmd edit seen 3 message %p% Enter a username!
cmd edit seen 4 exit
cmd edit seen 5 let %pl% = %args%[1]...