title: Convert HH:MM:SS
body: <p>I'm currently working on a call report however i've hit a snag. I need to calculate how long an agent has spent on the phone, the source data is in HH:MM:SS for the call duration. as in 1hr 12mins 10 seconds as appose to a number of seconds.  So if 2 agents had taken 2 calls the time spent would sum up for that day. </p>
  
  <p>Is it possible to change this into seconds? or can anyone suggest something a but better?</p>