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);
      };
    });
  }
@method is[Day]()
@returns Boolean
@short Returns true if the date falls on the specified day.

@set
  isToday
  isYesterday
  isTomorrow
  isWeekday
  isWeekend
  isSunday
  isMonday
  isTuesday
  isWednesday
  isThursday
  isFriday
  isSaturday

@example

  tomorrow.isToday() -> false
  thursday.isTomorrow() -> ?
  yesterday.isWednesday() -> ?
  today.isWeekend() -> ?

**
@method isFuture()
@returns Boolean
@short Returns true if the date is in the future.

@example

  lastWeek.isFuture() -> false
  nextWeek.isFuture() -> true

**
@method isPast()
@returns Boolean
@short Returns true if the date is in the past.

@example

  lastWeek.isPast() -> true
  nextWeek.isPast() -> false

*