function getStylesheet() {
      var currentTime = new Date().getHours();
      if (0 <= currentTime&&currentTime < 12) {
       document.write("<link rel='stylesheet' href='css/global-f3c000.css' type='text/css'>");
      }
      if (12 <= currentTime&&currentTime < 18) {
       document.write("<link rel='stylesheet' href='css/global-47bd94.css' type='text/css'>");
      }
      if (18 <= currentTime&&currentTime < 24) {
       document.write("<link rel='stylesheet' href='css/global-3e7718.css' type='text/css'>");
      }
}

getStylesheet();