Using a time duration to print out data where every 2 seconds is a pixel

[cjt22 at bath.ac.uk]

On Sep 10, 3:57 pm, cj... at bath.ac.uk wrote:
> Thanks however I am still having a problem using the time module for
> arithmetic
>
> My string times are of values such as 09:55:17
>
> and I have code such as:
>
> >from time import *
> >startPoint = strptime(step.sTime, "%H:%S:%M")
> >finishPoint = strptime(step.fTime, "%H:%S:%M")
> >duration = mktime(startPoint) - mktime(finishPoint)
>
> but it generates the error
>
> >OverflowError: mktime argument out of range
>
> Cheers

Perhaps I need to import the datetime module?