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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
 asdf asdf s
</body>
</html>
 
var currentTime = new Date().getHours();
var day = 7 <= currentTime && currentTime < 20;
document.body.style.backgroundImage = 'url('+ (
  day?
  "//placehold.it/300x300/ff4&text=DAY":
  "//placehold.it/300x300/000&text=NIGHT"
) +')';
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