Returns a new date object that is set to a given number of seconds relative to the receiver.
- iOS 2.0+
- macOS 10.6+
- tvOS 9.0+
- watchOS 2.0+
The number of seconds to add to the receiver. Use a negative value for seconds to have the returned object specify a date before the receiver.
NSDate object that is set to
seconds seconds relative to the receiver. The date returned might have a representation different from the receiver’s.