Interesting date

I'm trying to compute the date 250 days ago and I get this

$now = getdate(strtotime("now"));
$old = getdate(strtotime("-250 days"));

and I get right now with

$old["mon"] and $old["mday"]

31 june. Well, that doesn't sound right.
Can you spot the error?
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I didn't know sci.bio.paleontology was that low traffic until I tried read
the thread "Where is everyone?" and found it to be expired.
.