main.js

  var config = {
    testing      : true,                  // testing?
    parent       : '#advent-calendar li', // parent selector
    class_prefix : ' date-',              // class selector
    element      : ' a',                  // element selector
    punch        : new Date()             // date object
  }

  if (config.testing === true) {                                               // testing. select all dates, enable modals
    $(config.parent + config.element)
      .attr('data-toggle', 'modal')
      .addClass('open');
  } else {
    if (config.punch.getFullYear() >= 2012 && config.punch.getMonth() >= 11) { // it's december, proceed
      for (var i = 1; i < Math.min(config.punch.getDate(), 25); i += 1) {      // for every day up to today's date, enable their modal
        $(config.parent + config.class_prefix + i + element)
          .attr('data-toggle', 'modal')
          .addClass('open');
      }
    }
  }