// Blogger の場合

// num が一桁の数字のとき先頭に 0 を加えて二桁にする
function padzero(num){
 return ("" + num).length == 1 ? "0" + num : num;
}
function format(date){
 return date.getFullYear() + "-" + 
  padzero(date.getMonth()+1) + "-" + 
  padzero(date.getDate()) +
  encodeURIComponent("T" + padzero(date.getHours()) + ":" + 
   date.getMinutes() + ":" + 
   padzero(date.getSeconds()) + "+") +
  "09:00";
}
function createURL(url, numOfPost, date){
 return url + "search?updated-max=" + format(date) + "&max-results=" + numOfPost;
}