Creating timesheet

Hello All,

I have a created a time sheet on Google and been updating it for all of 2008. All of my time is logged in there perfectly no problem. However, I started a new file for 2009. Somehow all of my formulas don't work anymore. So I decided to try Zoho.

I have a few questions. The times are coming out standard AM/PM not military time. I want military time. Once I add all of the times at the end of the week I'm not getting a correct totals. Below are the formulas that I'm using (e.g.)

9:30:59 17:30:59, formula ((b1-a1))*24

Adding time for the week =sum(b1:b5)

Thanks for your time & attention,