iOS: Compare two dates

To compare two dates we use compare:

- (NSComparisonResult)compare:(NSDate *)anotherDate

compare Returns an NSComparisonResult value that indicates the temporal ordering of the receiver and another given date.

Parameters anotherDate

The date with which to compare the receiver. This value must not be nil. If the value is nil, the behavior is undefined and may change in future versions of Mac OS X.

Return Value

If:

The receiver and anotherDate are exactly equal to each other, NSOrderedSame

The receiver is later in time than anotherDate, NSOrderedDescending

The receiver is earlier in time than anotherDate, NSOrderedAscending