Code:
on *:text:!uptime*:#:{
  set -u10 %target $iif($2,$2,$mid(#,2-))
  set -u10 %channel #
  uptime 
}

alias uptime {
  sockclose uptime
  sockopen uptime nightdev.com 80
}

on *:sockopen:uptime:{
  if ($sockerr) { sockclose $sockname | halt }
  sockwrite -n $sockname GET /hosted/uptime.php?channel= $+ %target HTTP/1.1
  sockwrite -n $sockname Host: www.nightdev.com 
  sockwrite -n $sockname $crlf
}

on *:sockread:uptime:{
  if ($sockerr) { sockclose $sockname }
  var %data
  sockread %data
  tokenize 32 %data
  if ($1 isnum) && ($2) { msg %channel %target has been online for $1- }
  elseif (%data == The channel is not live.) msg %channel %target is currently not online.
}
Untested but should work.

Nillens @ irc.twitch.tv
Nillen @ irc.rizon.net