When I try this method: $interval = $dteStartDate[$intCnt]->diff($dteEndDate[$intCnt]); I get the following error when I run the page: " Fatal error : Call to undefined method DateTime::diff() in /var/www/evalHomeLime.php on line 254" Thank you Eric H. Lommatsch Programmer Pivotal Data Incorporated 2087 South Grant Street Denver, CO 80210 Tel 303-777-8939 Ext 23 Fax 888-282-9927 www.pivotaldata.com ericl@xxxxxxxxxxxxxxx -----Original message----- From: admin@xxxxxxxxxxxxxxxxxxx Sent: Thu 29-12-2011 16:07 To: 'Fatih P.' <fatihpiristine@xxxxxxxxx>; 'Frank Arensmeier' <farensmeier@xxxxxxxxx>; CC: 'Eric Lommatsch' <ericl@xxxxxxxxxxxxxxx>; php-general@xxxxxxxxxxxxx; Subject: RE: Question about date calculations > -----Original Message----- > From: Fatih P. [mailto:fatihpiristine@xxxxxxxxx] > Sent: Thursday, December 29, 2011 5:10 PM > To: Frank Arensmeier > Cc: Eric Lommatsch; php-general@xxxxxxxxxxxxx > Subject: Re: Question about date calculations > > On Thu, Dec 29, 2011 at 11:40 PM, Frank Arensmeier > <farensmeier@xxxxxxxxx>wrote: > > > 29 dec 2011 kl. 22.22 skrev Eric Lommatsch: > > > > > So far in looking at the functions that are available at > > > http://www.php.net/manual/en/ref.datetime.php I have not been able > to > > figure > > > out how to do what I need to do. Below is a snippet showing > > approximately > > > what I am trying to do. > > > > On the same page you are referring, there are plenty of examples on > how to > > calculate the difference between two dates. Choose one and see if it > fits > > your bill. Or is there any particular reason why you're writing your > "own" > > function? > > > > http://www.php.net/manual/en/ref.datetime.php#78981 > > > > /frank > > > > > > -- > > PHP General Mailing List (http://www.php.net/) > > To unsubscribe, visit: http://www.php.net/unsub.php > > > > > since you have everything in database tables why not to do this > calculation > on database side which would be much appropriate place ? > > /* columns > date_start = '2011-02-08'; > date_end = ' 2011-03-04'; > */ > > select DATEDIFF(date_end, date_start); > > http://dev.mysql.com/doc/refman/5.5/en/date-and-time- > functions.html#function_datediff I looked at this answer and see the date is from an array of a database and not 2 fields with in the table. While the DATEDIFF() is very useful in queries this will not help you unless both fields are in the table. Try this example $dteStartDate[$intCnt] = new DateTime($row[10]); $dteEndDate[$intCnt] =new DateTime($row[11]); $interval = $dteStartDate[$intCnt]->diff($dteEndDate[$intCnt]); echo $interval->format('%R%a days');
