Aerys\Ticker::updateTime PHP Method

    public function updateTime()
    {
        // Date string generation is (relatively) expensive. Since we only need HTTP
        // dates at a granularity of one second we're better off to generate this
        // information once per second and cache it.
        $now = (int) round(microtime(1));
        $this->currentTime = $now;
        $this->currentHttpDate = gmdate("D, d M Y H:i:s", $now) . " GMT";
        foreach ($this->useCallbacks as $useCallback) {
            $this->tryUseCallback($useCallback);
        }
    }