Although, Date::Calc is a good one to use, I have started using Class::Date because the interface is a little easier. I can't remember the syntax off-hand and haven't the time right now to look it up, but basically all you do is create a date object formatted the way you want and then add the seconds. Something like:

$date = date(<PUT YOUR FORMAT HERE>) # create new date object
$seonds = $num_secs . "s";
$date += $seconds
[download]

I think it should be that simple. Sorry I am being so vague here, but the Class::Date docs are pretty good and will no doubt enlighten you better than I have.

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I admit it, I am Paco.