> On 4 Oct 2016, at 20:10, Jason Ji via swift-users <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. Alex
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