You could calculate the time difference on the fly with mysql TIMEDIFF 
function 
[http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_timediff]
 
instead of store it in the db....
And this [http://www.gidnetwork.com/b-16.html] may help to store the 
time difference.

Céryl escribió:
> Hej all!
>
> Since my good advice just ago, I got to another bottleneck.
>
> I have a form in which the user selects two times (a start- and an end-
> time). The form works perfectly and the times get stored in the table
> as hh:mm:ss.
>
> However, I have a 3th row in the database that must hold the elapsed
> time between the two form-inputted times. I want the computer to
> calculate this. I figured I must do this in in the controller, I can
> of course even do after the $this->Model->save() action with a
> saveField, just before the redirect.
>
> However, I cannot seem to find a good example of making that function.
> I'm not sure how i get my timestamp back from the form, if they are
> simply substractable and how to store it back in the table.
>
> If it makes matters easier, elapsed time can be stored as an integer
> holding seconds between times in the table, I can probably calculate
> those back in elapsed minutes/hours in a later view of the table.
>
> Any idea's or links to examples of working with Timestamps? It always
> boggles me!
>
> >
>
>   


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