Did you try reformatting one of those cells with the offending dates?
Select all the cells in the column.
Format|Cells|number tab|custom category
type this in that Type: box
mmmm dd, yyyy
If any of the cells don't change what's displayed to a long date format (like
January 01, 2007), then those cells aren't really dates.
If this is what happens, then the next step is to share what is in those
cells--don't just say a date.
Copy and paste into your reply.
You'll get more responses if you show something like:
01-07
01/07
1/7
Jan 7
I'm out of my league here; i.e., I'm not computer literate enough to
understand your suggestions on how to determine if it's not a date but rather
it's text. I will say that the information in this column is all entered the
same. It's simply a birthdate, no year, just a date -- number of month (1
through 12), a slash, and then the day of the month (1 through 31). It's a
three column worksheet with last name, first name, birthday. The cells in
the birthday column that are not being included in the sort are no different
than the 82 that are sorting correctly.