docs: function buildRelativeAliases() {
    var special  = spaceSplit('Today Yesterday Tomorrow Weekday Weekend Future Past');
    var weekdays = English.weekdays.slice(0, 7);
    var months   = English.months.slice(0, 12);
    var together = special.concat(weekdays).concat(months);
    defineInstanceSimilar(sugarDate, together, function(methods, name) {
      methods['is'+ name] = function(d) {
        return fullCompareDate(d, name);
      };
    });
  }