<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 4 Oct 2016, at 20:10, Jason Ji via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class="gmail_signature"><div class="">Hello,</div><div class=""><br class=""></div><div class="">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: <a href="https://bugs.swift.org/browse/SR-2846" class="">https://bugs.swift.org/browse/SR-2846</a></div><div class=""><br class=""></div><div class="">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:</div><div class=""><br class=""></div><div class=""><pre class="gmail-code-java" style="margin-top:0px;margin-bottom:0px;padding:0px;max-height:30em;overflow:auto;white-space:pre-wrap;word-wrap:normal;color:rgb(51,51,51);font-size:12px"><span class="gmail-code-keyword" style="color:rgb(0,0,145)">import</span> Foundation
let today = Date()
let diffComponents = DateComponents(day: -1)
let newDate = Calendar.current.date(byAdding: diffComponents, to: today) <span class="gmail-code-comment" style="color:rgb(128,128,128)">//returns nil</span></pre></div><div class=""><br class=""></div><div class="">I've tried this in the swift REPL on Ubuntu 14.04 with both Swift 3.0-RELEASE, and the latest snapshot (October 2).</div><div class=""><br class=""></div><div class="">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.</div></div></div></div></div></blockquote><br class=""></div><div>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.</div><div><br class=""></div><div>Alex</div><br class=""></body></html>