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$hh += 0;   # stop warning as $hh may not be initialised
$dd += 0;   # same as $hh :)
$etime_secs= $ss+($mm*60)+($hh*60*60)+($dd*24*60*60);

$etime_secs= $ss+($mm*60)+($hh?$hh*60*60:0)+($dd?$dd*24*60*60:0);