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PHP and time, how to subtract time


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I have a variable that is storing a time value that has been retrieved from a database. It is in the format of: HH:MM:SS. What i need to do is subtract a half hour from this value, does PHP have any way of doing this?

I was thinking about using explode to get the hours and seconds and then using conditionals to determine how to reformatt it, but that seems bulky to me... Just wondering if anyone has a more efficient solution. Thanks for the help!
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$mysqldate = date("H:i:s", strtotime($row['your_mysql_date']));
$newdate = date("H:", strtotime($row['your_mysql_date'])) . (date("i:", strtotime($row['your_mysql_date'])) -30) . date("s", strtotime($row['your_mysql_date']));

echo $newdate;

Try that.
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My (modified) code works fine:
$tm = '14:00:00';
$ntim1 = date('G:i:s',strtotime($tm . ' -30 minutes'));
echo $ntim1;

You may not have noticed that I took out the space I originally had after the '-' in the original post.

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