World-Time Clock in ComputerCraft

if not switchcraft then
    os.loadAPI("json")
end
local x,y = term.getCursorPos()
while true do
  local obj = http.get("http://worldtimeapi.org/api/timezone/Europe/Helsinki").readAll()
  local tbl = json.decode(obj)
  local ts = tbl.unixtime
  term.setCursorPos(x,y)
  term.clearLine()
  term.write(os.date('%Y-%m-%d %H:%M:%S', ts))
end