=DATE(2000+LEFT(A1,1),MID(A1,2,2),RIGHT(A1,2))

Then...
<Format
<Cells
"Custom" tab
Enter: yyyy/mm/dd

--
Regards,
Dave


"Curtis" wrote:

I have a bunch of date with dates entered as 51231 for (2005/dec/31), I want
to convert these numbers into date format 2005/12/31, any suggestions,
please...

thanks in advance,

cd