• Getting Information About an NSDateComponents Object

• Setting Information for an NSDateComponents Object

• day

• era

• hour

• minute

• month

• second

• setDay:

• setEra:

• setHour:

• setMinute:

• setMonth:

• setSecond:

• setWeek:

• setWeekday:

• setWeekdayOrdinal:

• setYear:

• week

• weekday

• weekdayOrdinal

• year

• NSDateComponents undefined component identifier