ブラウザ側で日時指定で、リダイレクト先を切り替えるスクリプト ref: http://qiita.com/dribble13/items/cd5aa40d87d1e993bb51

file0.js

$(document).ready(function() {
  $('a.location_timer').each(function(index, target) {
    var startDate = $(this).attr('data-start-date');
    var endDate = $(this).attr('data-end-date');
    var nowDate = new Date();

    startDate = startDate ? new Date(startDate) : nowDate;
    endDate = endDate ? new Date(endDate) : null;

    if (startDate <= nowDate && (!endDate || nowDate <= endDate)) {
      location.href = $(this).attr('href');
    }
  });
});

file1.html

<a class="location_timer" href="http://qiita.com" data-start-date="2013/10/22 16:00" data-end-date="2013/10/30 23:59"></a>