So I’ve done some work:

1.  Might be possible no kMDItemLastUsedDate on a new Mac after using 
MigrationAssistant or of course if no Spotlight being used
2.  NSURLContentAccessDateKey returns the current date like mentioned here - 
http://stackoverflow.com/questions/13914600/get-the-real-last-opened-date 
<http://stackoverflow.com/questions/13914600/get-the-real-last-opened-date>
3.  The same problem with st_atimespec it returns the current date
4.  NSURLAttributeModificationDateKey seems to be what Path Finder is using to 
get the Attribute tag

So from what I see there is no real alternative to kMDItemLastUsedDate if that 
value is missing.  Additional thoughts?



> On 15 Mar 2016, at 1:04 AM, Fritz Anderson <fri...@manoverboard.org> wrote:
> 
> 
>> On 14 Mar 2016, at 10:39 AM, Jens Alfke <j...@mooseyard.com> wrote:
>> 
>> Unix filesystems do keep a last-accessed date for files, but it looks like 
>> NSFileManager doesn’t expose an attribute for it. You can call stat() and 
>> get the st_atimespec field of the result.
> 
> NSURL *Resource* methods can get at NSURLContentAccessDateKey:
> 
>> The time at which the resource was most recently accessed, returned as an 
>> NSDate object if the volume supports accessdates, or nil if access dates are 
>> unsupported (read-only).
> 
> The resource stuff is painful, especially in Swift, but indispensable.
> 
>       — F
> 

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