[Koha] Date problems adding new members

[Mike Dalgity]

On a new Koha 2.2.8 using either the default or npl templates and adding a
new member leaving the joining and expiry date fields blank results in no
date being inserted.  Also when manually entering the joining date the
expiry date is still not auto calculated.  I checked liblime's demo and it
works there.  Can someone point me to the section of code that's supposed to
do this?  I've looked at memberentry.tmpl for both templates and
memberentry.pl and am having difficulty following what the code is doing.
There's also nothing in the error log.

Thanks,
Mike D.