The above answers are adequate, but I'd like to add that all you have to do is treat the 600 like a string instead of a number. So if you wanted to make a "24 hour" variable, all you'd have to do is something like; 
$time = 600;
($time = "0".$time) if ($time < 1000);

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In reply to Re: Is there a way of storing 600 in a scalar as 0600 (24 hour clock style)? by tenatious
in thread Is there a way of storing 600 in a scalar as 0600 (24 hour clock style)? by Anonymous Monk

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