subtracting time from date and time

From: Date: Mon, 18 Jun 2007 17:35:36 +0000
Subject: subtracting time from date and time
Groups: php.general 
Request: Send a blank email to php-general+get-257323@lists.php.net to get a copy of this message
I am trying to figure out what is the most accurate way to find the time after I subtract 5 min,15 min, 30 min 1 hour 2 hours and 5 hours from a date and time that is formatted like this 20070617T193500 this is the way it has to be formatted to work in a vcalendar

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