code: function buildRelativeAliases() {
      var special  = 'today,yesterday,tomorrow,weekday,weekend,future,past'.split(',');
      var weekdays = English['weekdays'].slice(0,7);
      var months   = English['months'].slice(0,12);
      extendSimilar(date, true, false, special.concat(weekdays).concat(months), function(methods, name) {
        methods['is'+ simpleCapitalize(name)] = function(utc) {
         return this.is(name, 0, utc);
        };
      });
    }
docs: *
  @method is[Day]()
  @returns Boolean
  @short Returns true if the date falls on that day.
  @extra Also available: %isYesterday%, %isToday%, %isTomorrow%, %isWeekday%, and %isWeekend%.
  
  @set
  isToday
  isYesterday
  isTomorrow
  isWeekday
  isWeekend
  isSunday
  isMonday
  isTuesday
  isWednesday
  isThursday
  isFriday
  isSaturday
  
  @example
  
  Date.create('tomorrow').isToday() -> false
  Date.create('thursday').isTomorrow() -> ?
  Date.create('yesterday').isWednesday() -> ?
  Date.create('today').isWeekend() -> ?
  
  **
  @method isFuture()
  @returns Boolean
  @short Returns true if the date is in the future.
  @example
  
  Date.create('next week').isFuture() -> true
  Date.create('last week').isFuture() -> false
  
  **
  @method isPast()
  @returns Boolean
  @short Returns true if the date is in the past.
  @example
  
  Date.create('last week').isPast() -> true
  Date.create('next week').isPast() -> false
  
  *