Thanks. I know my syntax isn't quite right, but is this close to what
I need to do?
echo "<tr><th>Completion Time:</th></tr><tr><td>" . date('F j, Y
g:i:sa', strtotime($row["login_timestamp"] - ["submit_timestamp"])/60)
. "</td></tr>";
On Tue, May 25, 2010 at 10:01 AM, Peter Lind <peter.e.l...@gmail.com> wrote:
> On 25 May 2010 15:55, Bruce Gilbert <webgu...@gmail.com> wrote:
>> Here is the situation. I have a form which sets a timestamp when a
>> user logs in using UPDATE in SQL. The field is called
>> 'login_timestamp' and is in a table called 'Candidates'. I have
>> another timestamp which is set when a user submits the form data into
>> the DB and it is called 'submit_timestamp' . What I want to do is
>> determine the amount of time the user takes to complete the form by
>> subtracting the 'login_timestamp' time form the 'submit_timestamp'
>> time. I am using SQL to extract the data here.
>>
>> $sql = "SELECT Responses.name,Answers,submit_timestamp,login_timestamp
>> FROM Responses LEFT JOIN Candidates USING (user_id)";
>>
>> and then to display the timestamp in readable form.
>>
>> echo "<tr><th>Completion Time:</th></tr><tr><td>" . date('F j, Y
>> g:i:sa', strtotime($row["login_timestamp"])) . "</td></tr>";
>>
>> so I need to know how to subtract from two timestamp fields, two
>> different tables and come up with the difference in minutes.
>>
>
> In case you're using MySQL, timediff can do the job:
> http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_timediff
>
> Otherwise, just do strtotime(endtime) - strtotime(starttime) / 60.
> That's the difference in minutes.
>
> Regards
> Peter
>
>
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--
::Bruce::
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