Re: newbie - problems with Select and timestamp(14) calculation

Hi, There seems to be several ways to compare time. This is what I use to log out visitors if they do nothing in 1000 seconds. This would be easier to do with sessions, but when I made the site my ISP did not have PHP 4.x available. logtime column type is DATETIME, and it stores the date as mm-dd-yyyy. UNIX_TIMESTAMP is seconds from some date in 1970(?), but you have to be prepared for the overflow problem in 2037. I have no idea about the performance issues of this setup, but it works fine for me. Regards, Jyrki Leppala $sql = "SELECT (UNIX_TIMESTAMP() - UNIX_TIMESTAMP(logtime)) AS timediff FROM yourtable WHERE sessionid='$sessionid' "; $result = mysql_query( $sql ) or die ( 'Ei voi lukea' ); $row = mysql_fetch_array($result); if ($row[timediff]>1000) $userlevel=0; // or whatever you need to do here $sql = "UPDATE table SET logtime=SYSDATE(), userlevel='$userlevel' WHERE sessionid='$sessionid' "; $result = mysql_query( $sql ) or die ( 'Ei voi päivittää' ); On 18 Oct 01, at 16:11, p.whiter wrote: From: "p.whiter" <p.whiter@0800dial.com> To: <php-db@lists.php.net> Date sent: Thu, 18 Oct 2001 16:11:23 +0100 Subject: Re: [PHP-DB] newbie - problems with Select and timestamp(14) calculation > Thanks for the reply, but the Timestamp(14) column (log_time) in my DB > saves the time as '20011018134612' this is the same format as the > NOW()+0 I think? > > I have tried various methods to get this to work. I've gone through > the manual and various books I have here but am having no joy at all. > > I have spent far too much time on this, it really should be quite > straightforward to compare against a Timestamp column!! If anyone else > has any ideas...... > > Thanks > Paul >