You could use a helper column with a formula like:
=--TEXT(A1,"0000-00-00 00\:00\:00")

and give the column a numberformat of:
mmmm dd, yyyy hh:mm:ss
or
yyyy/mm/dd hh:mm:ss




BDT wrote:

I have columns of numbers that represent date/time info. For instance I have
the number 20081029092245 which represents:

2008/10/29 09:22:45 or October 29, 2008 at 9:22 AM

And I want it to display as one of the above formats.

I can parse the big number and concatenate the resulting columns, but is
there a less cumbersome way to do this with Format/Cells/Number/Custom or
something similar?

Many thanks.

--

Dave Peterson