Countif of Hours and Mins not dates

Afternoon all

I have a data feed that gives a column of cells formated mm/dd/yy hh:mm
These are call entries, what i want to do is count all the occurances each hour, so count all the entries say between 9am and 10am. However the column is very long and holds data for many weeks so i want to be able to ignore the date part of the cell.

For example

3/17/09 9:58
3/18/09 10:58
3/18/09 8:58
3/19/09 8:58
3/19/09 9:58
3/19/09 9:58

So the entries between 9 and 10 are = 3

Ideally i do not want to do text to colums and split out the parts. i would like to leave the source data alone.

Nick