It isn't a gif, he's got a bunch of images at 15 minute intervals. http://imgs.xkcd.com/comics/now/18h15m.png http://imgs.xkcd.com/comics/now/18h15m.png http:

It isn't a gif, he's got a bunch of images at 15 minute intervals. http://imgs.xkcd.com/comics/now/18h15m.png http://imgs.xkcd.com/comics/now/18h15m.png http://imgs.xkcd.com/comics/now/18h30m.png http://imgs.xkcd.com/comics/now/18h30m.png http://imgs.xkcd.com/comics/now/18h45m.png http://imgs.xkcd.com/comics/now/18h45m.png The server just loads the right one for the given time.