> On 5 Oct 2016, at 16:48, Alex Blewitt via swift-users <swift-users@swift.org> > wrote: > > >> On 4 Oct 2016, at 20:10, Jason Ji via swift-users <swift-users@swift.org >> <mailto:swift-users@swift.org>> wrote: >> >> Hello, >> >> I'm having an issue with (NS)Calendar on Linux which I think is a bug, but I >> just wanted to check first if it was just me or if this is indeed a bug. >> I've filed a bug report here, just in case: >> https://bugs.swift.org/browse/SR-2846 <https://bugs.swift.org/browse/SR-2846> >> >> In short, Calendar has a method date(byAdding:to:wrappingComponents:) which >> returns a new date which is the result of date arithmetic on the passed-in >> date. It works fine on El Capitan, but doesn't seem to work properly on >> Ubuntu 14.04. Below is some sample code: >> >> import Foundation >> >> let today = Date() >> let diffComponents = DateComponents(day: -1) >> let newDate = Calendar.current.date(byAdding: diffComponents, to: today) >> //returns nil >> >> I've tried this in the swift REPL on Ubuntu 14.04 with both Swift >> 3.0-RELEASE, and the latest snapshot (October 2). >> >> If anyone else could try this out as a sanity check for me, that would be >> great - I'd be happy to be embarrassed that I've done something wrong. > > It's worth explicitly specifying a calendar (so that it rules out any > environmental setup) -- for example, Calendar(identifier:.gregorian). > However, I see 'nil' as well as the return result for this operation, so it > could be a bug.
I think the bug is here: https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/NSCalendar.swift#L464 <https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/NSCalendar.swift#L464> _convert(comps.isLeapMonth, type: "L", vector: &vector, compDesc: &compDesc) The leap month is defined with a capital letter here, but a lower-case letter when it's decoded: https://github.com/apple/swift-corelibs-foundation/blob/338f4bf3a89c75a0420b49f5701466e106af02b5/CoreFoundation/Locale.subproj/CFCalendar.c#L423 <https://github.com/apple/swift-corelibs-foundation/blob/338f4bf3a89c75a0420b49f5701466e106af02b5/CoreFoundation/Locale.subproj/CFCalendar.c#L423> case 'l': return UCAL_IS_LEAP_MONTH; The lower-case l should be the correct version so this probably needs to be changed here. In addition, there are optional-of-bool issues here; the 'comps.isLeapMonth' is a boolean value, which means it attempts to roll forward the leap month (which doesn't make sense). I think the error was introduced here, although it didn't help that the capitalisation was also wrong at the time: https://github.com/apple/swift-corelibs-foundation/commit/d3300b7118924d6ad8ba411d317f33eade854bc5 <https://github.com/apple/swift-corelibs-foundation/commit/d3300b7118924d6ad8ba411d317f33eade854bc5> Alex
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