Re: A "bad" Unix Timestamp?

On Wed, 20 Oct 2004, Warren Oates wrote:

> it turns out (and rightly so) that you can't create a "bad" Unix
> timestamp.
>
> date ("F d Y",strtotime("2004-09-31"));
>
> will return October 01 2004 and fwiw, so will
>
> date ("F d Y",mktime(0,0,0,9,31,2004));

Rightly or wrongly, I personally have found this quite a useful "feature".
It means you can *always* calculate the last date in the current month:
mktime(0, 0, 0, date("m") + 1, 0, date("Y"))

or tomorrow:
mktime(0, 0, 0, date("m"), date("d") + 1, date("Y"))

This latter is nicer than time() + 86400 because that doesn't always
seem to return exactly midnight.

So in your example, you could determine if the user has entered 31 in a
month with only 30 days with:

if (date("d", mktime(0,0,0,$m+1,0,$y)) < $d) {
// not that many days in the selected month
}

Of course this assumes a valid $m and $y.

--
Matt