solution:

on *:ctcpreply:*time*:{ 
  .msg %chan  $+ %timenick $+ \'s time and date: ( $+ $2- $+ ) | unseT %timenick
}
on *:TEXT:!time*:#:{ 
  if ($2 == $null) { notice $Nick choose a nickname please. | halt }
  if ($2 !ison $chan) { notice $Nick Sorry, but $2 $+  is not on $chan $+ . | halt }
  else {
    if ($2 ison $chan) {
      set %Timenick $2 
      set -u10 %chan $v2
      .ctcp $2 time
    }
  }
}