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NSDate objects encapsulate a single point in time, independent of any particular calendrical system or time zone. Date objects are immutable, representing an invariant time interval relative to an absolute reference date (00:00:00 UTC on 1 January 2001). The NSDate class provides methods for comparing dates, calculating the time interval between two dates, and creating a new date from a time interval relative to another date.
NSDate objects can be used in conjunction with objects to create localized representations of dates and times, as well as with objects to perform calendar arithmetic. NSDate is toll-free bridged with its Core Foundation counterpart,. See for more information on toll-free bridging. Important The Swift overlay to the Foundation framework provides the structure, which bridges to the NSDate class. For more information about value types, see in.
Subclassing Notes. Your subclass may use a different reference date than the absolute reference date used by NSDate (00:00:00 UTC on 1 January 2001). If it does, it must still use the absolute reference date in its implementations of the methods.
That is, the reference date referred to in the titles of these methods is the absolute reference date. If you do not use the absolute reference date in these methods, comparisons between NSDate objects of your subclass and NSDate objects of a private subclass will not work.