By having SReject's JSON script for mIRC installed in your copy of mIRC, a simple !uptime command is pretty basic compared to using sockets.

Code:
ON $*:TEXT:/^!uptime(\s\w+)?$/iS:#: {
  VAR %chan $IIF($2,$2,$remove($chan,$chr(35)))
  JSONOpen -uw uptime https://api.twitch.tv/kraken/streams/ $+ %chan $+ ?nocache= $+ $ticks
  JSONUrlHeader uptime Client-ID avm4vi7zv0xpjkpi3d4x0qzk8xbrdw8
  JSONUrlGet uptime
  MSG $chan %chan $IIF($JSON(uptime, stream, created_at),has been live for $duration($calc($ctime - $TwitchTime($JSON(uptime, stream, created_at))),2) $+ .,is not live at the moment.)
  JSONClose uptime
}

alias TwitchTime {
  if ($regex($1-, /^(\d\d(?:\d\d)?)-(\d\d)-(\d\d)T(\d\d)\:(\d\d)\:(\d\d)(?:(?:Z$)|(?:([+-])(\d\d)\:(\d+)))?$/i)) {
    var %m = $Gettok(January February March April May June July August September October November December, $regml(2), 32), %d = $ord($base($regml(3),10,10)), %o = +0, %t
    if ($regml(0) > 6) %o = $regml(7) $+ $calc($regml(8) * 3600 + $regml(9))
    %t = $calc($ctime(%m %d $regml(1) $regml(4) $+ : $+ $regml(5) $+ : $+ $regml(6)) - %o)
    if ($asctime(zz) !== 0 && $regex($v1, /^([+-])(\d\d)(\d+)$/)) {
      %o = $regml(1) $+ $calc($regml(2) * 3600 + $regml(3))
      %t = $calc(%t + %o )
    }
    return %t
  }
}


With this you can simply use !uptime by itself to get your channels current uptime, or you can specify a channel after the !uptime command to get the uptime of that channel.

Note that I did not write the TwitchTime alias, I found that on these forums somewhere.

My Twitch mIRC Bot Games and Stuff