Case
Calendar.MatchingPolicy.nextTimePreservingSmallerComponents
iOS 8.0+
iPadOS 8.0+
Mac Catalyst 8.0+
macOS 10.10+
tvOS 9.0+
watchOS 2.0+
If specified, and there is no matching time before the end of the next instance of the next higher component to the highest specified component in the
DateComponents argument, the method will return the next existing value of the missing component and preserves the lower components’ values (e.g., no 2:37am results in 3:37am, if that exists).case nextTimePreservingSmallerComponents