jQuery.extend(DateInput.DEFAULT_OPTS, {
  month_names: ["Januari", "Februari", "Maart", "April", "Mei", "Juni", "Juli", "Augustus", "September", "Oktober", "November", "December"],
  short_month_names: ["Jan", "Feb", "Maa", "Apr", "Mei", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dec"],
  short_day_names: ["Zo", "Ma", "Di", "Wo", "Do", "Vr", "Za"]
});

jQuery.extend(DateInput.DEFAULT_OPTS, {
  stringToDate: function(string) {
    var matches;
    if (matches = string.match(/^(\d{4,4})-(\d{2,2})-(\d{2,2})$/)) {
      return new Date(matches[1], matches[2] - 1, matches[3]);
    } else {
      return null;
    };
  },

  dateToString: function(date) {
    var month = (date.getMonth() + 1).toString();
    var dom = date.getDate().toString();
    if (month.length == 1) month = "0" + month;
    if (dom.length == 1) dom = "0" + dom;
    return date.getFullYear() + "-" + month + "-" + dom;
  }
});