On Sun, Nov 21, 2010 at 1:24 PM, Rodrigo Bernardo Pimentel
<report@bugs.python.org> wrote:
..
> I was writing tests for this issue, when something struck me: ok, datetime(year, month, day, 24) is valid.
> But is datetime(year, month, day, 24, 1) valid? Or datetime(year, month, day, 24, 0, 0, 1)?
>

As you make progress on the patch, you will face more questions.  For
example, what should datetime(y, m, d, 24).date() return?  date(y, m,
d) or date(y, m, d) + timedelta(1)?  Should strptime() parse '24' as a
valid %H field? Similarly, should strftime() produce '24'?  Is
datetime(y, m, d, 24) equal to datetime(y, m, d) + timedelta(1)? If
so, hash calculation should be special cased.

On your original question, I feel that hour=24 should be allowed
regardless of the other values.  I would recommend, however, that you
review python-dev discussion about allowing second=60 (search for
"leap second").  Once you have a reference implementation you will
need to explain motivations behind your choices on python-dev.