Is there a way to change part of a cell's content? I have the following data -

7/7/2008 1:25:00 PM
7/7/2008 1:18:00 PM
7/7/2008 6:19:00 PM
7/7/2008 12:34:00 AM

I want to change 7/7/2008 to Jul-07 but still keep the time the way it is.
I can change the way the data is viewed (using Format, Cell, Number) but it
doesn't change the actual data in the cell. If I do a Replace command it
replaces all the data and I lose the time information. I need to change the
date data because if not I cannot get a COUNT IF function to work on it. Any
ideas? Thanks!