How can I change an image depending on the time of day?

A useful effect can be to change CSS elements depending on the time of day. The following example changes a background image.

var d = new Date();
var n = d.getHours();
if (n > 19 || n < 6)
   $("#header").css("background", "url('nacht.jpg')");
   $("#header").css("background", "url('tag.jpg')");
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