Mine

alias goaway { 
set %away on
set %awaytime $ctime
set %awayreason $1-
away $1-
amsg [[AWAY]]: I am away at $time for reason: %awayreason $+ . If you need me, please /ms send $me MESSAGE.
}

alias comeback {
set %away off
if (%away == off) { 
away 
amsg [[BACK]]: I am now back from: %awayreason $+ . I was gone for $calc(%awaytime - $ctime)
unsetall
}
}