Bug 24138: Move the calculation out of the sub

Bug 24138: Move the calculation out of the sub

No changes expected here. For the next patch we are going to need to add
test and calculate the new debarment date. To ease the writing of these
tests the calculation is moved out of the existing subroutine.

Signed-off-by: Hugo Agud <hagud@orex.es>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>