Bug 13242: Fix DateUtils for 'infinite' dates (ie year 9999)

Bug 13242: Fix DateUtils for 'infinite' dates (ie year 9999)

TEST PLAN:

- Method 1--with UT

  - Use the UT associated to this bug, without applying this patch, and then
    after applying this patch

- Method 2--using Koha

  - Without this patch
  - Find a borrower with several checkouts that are not overdue.
  - Debarred the borrower
  - Go on circ/circulation-home.pl page
  - Select Check in tab, and do a check in
  - It required more than 20s to display the return.pl page
  - Apply the patch, and repeat previous steps
    => return.pl is immediately displayed.

Followed method 2. Time problem no longer exists.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>