I have a concatenation in cell C1 based on cells A1 and B1 as follows:

A B C
405 1/31/06 Concatentate(A1,&"-",&B1)


Cell C1 subsequently reads 405-38748. I have been changing formats in cell
B1 with no luck. I need cell C1 to read 405-1/31/06. What am I missing?