Re: Date Subtraction

I don't think you can use strtotime in that case. However, assuming that your data is properly formatted every time, you can use a simple function like this (I'm doing it from memory, so it might not actually work): <?php function conv_time ($s) { preg_match ("/^([0-9]*) days, ([0-9]*)\:([0-9]*)\:([0-9]*)(\.[0-9]*)$/", $s, $res); return $res[1] * 86400 + $res[2] * 3600 + $res[3] * 60 + $res[4] + $res[5]; } echo number_format (conv_time ("181 days, 7:16:6.75") - conv_time ("181 days, 7:11:06.66"), 2); ?> Hope this helps. Cheers, Marco -- ------------ php|architect - The Magazine for PHP Professionals The monthly magazine dedicated to the world of PHP programming Check us out on the web at http://www.phparch.com!