/away {
  set %time $ctime
  set %reason $1-
  msg $chan 2I am now away because I'm7 %reason $+  2I left at 7 $time EST
  /nick Def|Out
}
/back { 
  msg $chan 2I am back from7 %reason   2I was gone for7 $duration($calc($ctime - %time))
  unset %reason
  /nick Definition
}