`Published` field not getting set from FileSystemWatcher

https://github.com/plukevdh/NuGet.Lucene/blob/master/source/NuGet.Lucene/LucenePackageRepository.cs#L282

The above appears to set the Published field from the LastUpdated field, but in my current use of this (via Klondike, see themotleyfool/Klondike#1), the date is always set to December 31st, 1600. Not sure why this would be