Transaction posted-date slot

[Kevin Hale Boyes]

I was looking at my GC XML file and noticed a new element under a transaction.
In the transaction slot there was a "date-posted" KVP.

I'm not sure but I think that feature was added in a commit from
almost two years ago:
http://svn.gnucash.org/trac/changeset/18925

How does this new element work?  Is it always set for new transactions?
I wonder because it seems to have shown up only once even though I
have many transactions per month..

I'm running 2.4.8 on Fedora 15.

Thanks,
Kevin.