DateComponentsFormatter returns incorrect string when formatting a TimeInterval

Originator:meteochu
Number:rdar://32513237 Date Originated:6/1/2017
Status:OPEN Resolved:
Product:iOS SDK + Foundation Product Version:
Classification:UI/Usability Reproducible:Always
 
Area:
Foundation

Summary:
DateComponentsFormatter.string(for: TimeInterval) will return an incorrect string when passing a TimeInterval greater than `Int32.max` (2.1B), and the result will be a string of an overflown Int32.

Steps to Reproduce:
1. Create a DateComponentsFormatter instance.
2. Get the result from string(from: TimeInterval) of an `Int32.max + 1` Double.

Expected Results:
The expected string should be "68y 0m 2w 4d 3:14:07"

Observed Results:
The returned string is "-68y 0m 2w 4d 4:14:07"

Version:
iOS 10.3 SDK Foundation with Xcode 8.3

Notes:
Current workaround is to use `string(from:Date, to:Date)` where the "to" date is a `.addingTimeInterval(timeInterval)` of the "from" date.

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