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Re: Dates
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Re: Dates


  • Subject: Re: Dates
  • From: rsharp <email@hidden>
  • Date: Thu, 6 Sep 2001 07:30:56 -0500 (CDT)

On Thu, 6 Sep 2001, Angela Brett wrote:

> Hello,
>
> I was looking through the NSDate docs trying to figure out how to get
> the NSString representations of a date (which I eventually found in
> NSCalendarDate) but I saw something which I'm a little curious about:
>
>
> Principal Attributes
>  Seconds since absolute reference date (1 January, 2001, GMT)
>
>
> I thought most UNIX systems used 1970 for that... is Mac OS X ticking
> different because it's nice and modern, or is it just the NSDate
> class which stores the date differently? I notice there is a method
> which returns the time interval since 1 January 1970, GMT, but that
> is just called a reference date and not the absolute reference date.

IIRC, this was done to extend the expiration date a bit where we'd hit
that 2-billion seconds since EPOC. I think this reference can be added to
and taken away from to represent dates in either direction (i.e. before
and after 1-Jan-2001). I may be wrong though.

Rick Sharp
Instant Interactive(tm)


References: 
 >Dates (From: Angela Brett <email@hidden>)

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