Right the comment of Mike is fair,
I don't know what you are doing (a lie), anyway your interest is to
know a time interval rather than a date
you should design a object with a referential start-time:
CFAbsoluteTime timeNow(void)
{
return (CFAbsoluteTime) (CFAbsoluteTimeGetCurrent() -
kCFAbsoluteTimeIntervalSince1970);
// you have similar access thru Cocoa
}
and use only NSDate (rather than to play with it, it's also a main
memory consumer) to make a representation of this time interval at
(T), I think it will save you a lot of pain
for the next time... :)
Cheers!
On Fri, Mar 20, 2009 at 2:50 PM, Mike Abdullah
<cocoa...@mikeabdullah.net> wrote:
>
> On 20 Mar 2009, at 21:17, Charles E. Heizer wrote:
>
>> Thanks,
>> No it's just playing around right now. It would be nice to be able to
>> specify if you wanted NSDate to be sub-second or second precision based.
>>
>> Just as question, can NSDate be overridden to be second precision based?
>
> Theoretically yes. Practically, it would be a rather bad idea. 1 second is
> meaningful to you, but consider a completely different culture's calendaring
> system where "a second" is actually equivalent to 3 of ours seconds. What
> would second precision be then?
>
> The point is that you don't really want to test the equality of two dates.
> Instead you want to compare them like so:
>
> date1 >= date2
> date1 <= date2
>
> Or you want to know if they're roughly equal to each other. "Is date1 within
> 0.5 seconds of date2"
>
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--
-mmw
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