Re: difference in absolute days

On Tue, 16 Dec 2008, Perrin Harkins wrote:

> On Mon, Dec 15, 2008 at 8:29 PM, Alex Teslik <[email protected]> wrote:
>> On Mon, 15 Dec 2008 20:04:26 -0500, Perrin Harkins wrote
>>
>>> my $d1 = DateTime->today;
>>> my $d2 = $d1->clone->subtract(years => 1);
>>>
>>> my $dur = $d1->delta_days($d2);
>>> print $dur->in_units('days') . "\n";
>>>
>>
>> corrected above. I don't know why the days method didn't work.
>
> Thanks Alex.  That does what I want.
>
> Previously I was trying to make this work with overloaded subtraction
> instead of delta_days():
>
> my $dur = $d1 - $d2;
>
> The object returned here gives '0' for days() and in_units('days') and
> '1' for years().  I think that's by design, but something seems off
> here, and my guess is that it's the return of days() on the
> delta_days() Duration object (which gives me '2').

The whole subtraction API and DT::Duration API kind of suck. They accreted 
over time and ended up rather confusing (thus two different delta_days 
methods, one in DateTime.pm and the other in DT::Duration).

Unfortunately, at this point I feel the burden of backcompat, and I can't 
see how to fix it without adding even more methods, which would have even 
worse names.

But I'll fix it all when I do DateTime6, I promise ;)


-dave

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