Something

Alias bk {
  away
  ame is back from: ( $+ %away.msg $+ ) at $time $+ GMT. I was gone for: ( $+ $duration($awaytime) $+ )
  nick Bethyy
}

alias aw {
  set %away.msg $1-
  ame is now away at $time $+ GMT. Reason: ( $+ $1- $+ )
  away %away.msg
  nick Beth|AFK
}