local time_url = "http://www.worldtimeserver.com/current_time_in_US-CA.aspx" --Replace this

local function getTime()
                local request = http.get(time_url)
                local time_content = request.readAll()
                request.close()
                local search_text = [[<div id="analog%-digital">.-<span class="font7">(.-)</span>]]
                local _,_, global_time = time_content:find(search_text)
                local global_time = global_time:gsub("%s", "")
                print(global_time)
end
while true do
  rs.setOutput("back", true)
  os.pullEvent("redstone") --Waits until redstone changes states
  if not rs.getInput("back") then
        print("Circuit tripped at: "..getTime())
  end
end