Changing the time of day

Change the appearance of the map to reflect the time of day.
<!DOCTYPE HTML>
<html>
  <head>
    <script src="https://cdn-webgl.eegeo.com/eegeojs/early_access/latest/eegeo.js"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.1/leaflet.css" rel="stylesheet" />
  </head>
  
  <body>
  <div style="position: relative">
    <div id="map" style="height: 400px"></div>
    <script>
      var map = L.eeGeo.map("map", "your_api_key_here", {
        center: [37.7858, -122.401],
        zoom: 16
      });

      var times = [L.eeGeo.themes.time.Dawn, L.eeGeo.themes.time.Day, L.eeGeo.themes.time.Dusk, L.eeGeo.themes.time.Night];
      var timeIndex = 0;
      setInterval(function() {
        map.themes.setTime(times[timeIndex]);
        timeIndex = (timeIndex + 1) % times.length;
      }, 5000);
    </script>
  </div>
  </body>
</html>