Formatting Row Labels in Pivot Table/Chart

Was working on this problem for a poster:
http://www.excelforum.com/excel-form...than-12am.html

I can't seem to get the pivot table/chart to format exactly as I desire. It seems that as soon as I add 'group by hour and day' Excel forces the formatting to AM/PM and I want to keep it military. I want to group by hour, so that data that occurs at 6:00 and at 6:30 are grouped, and I had to group by day so that 6:00 on 1/1 was separated from 6:00 on 1/2.

Attached is a worksheet which shows the desired chart format (not a pivot chart), and the attempted pivot chart. I want the pivot chart to match the 'simple' chart in look and feel. Any attempts to change the formatting of the row labels to 'h' is promptly ignored by Excel.

Note the two tasks that occur at hour 18 (one at 18:00 and the other at 18:20 (you will need to see the formatting to truly see the minutes)). Those should be combined in the pivot table (and they are) and on my 'adjusted' table (where I used SUMIFS).

Thanks,
Pauley

You would need to calculate a new hour value in source data to prevent each time entry getting a unique slot and not grouping as that removes formatting ability