On Jan 7, 2015, at 6:18 PM, Graham Cox <graham....@bigpond.com> wrote:

> I want a label in my interface to display a relative time using a "sensible" 
> approximate scale depending on the value. I'm not sure if I can use 
> NSDateFormatter for this - it seems it's a bit too fixed in using only the 
> units you assign.
> 
> For example, if the value is less than a minute, it should say "x seconds 
> ago", if it's in the range of 1-59 minutes, "x minutes ago", "about an hour 
> ago", "x hours ago", "yesterday", "x days ago", "about a week ago", "x weeks 
> ago", "about a month ago", "x months ago" - you get the picture. Is this 
> possible using NSDateFormatter, or do I have to roll my own for this?

If you can require 10.10 or iOS 8, there's a new class for this: 
NSDateComponentsFormatter.  There's no class reference for it yet.  It's 
described in the Foundation release notes 
<https://developer.apple.com/library/mac/releasenotes/Foundation/RN-Foundation/#10_10Formatters>
 and in its header file.

If you can't require those versions of the OSes, then I think you have to roll 
your own.  Or find a third-party library/framework/class.

Regards,
Ken


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