+ if($datedue && ! $datedue->output('iso')){
+ warn "Invalid date passed to AddRenewal.";
+ return undef;
+ }
+ # If the due date wasn't specified, calculate it by adding the
+ # book's loan length to today's date or the current due date
+ # based on the value of the RenewalPeriodBase syspref.
+ unless ($datedue) {
+
+ my $borrower = C4::Members::GetMemberDetails( $borrowernumber, 0 ) or return undef;
+ my $loanlength = GetLoanLength(
+ $borrower->{'categorycode'},
+ (C4::Context->preference('item-level_itypes')) ? $biblio->{'itype'} : $biblio->{'itemtype'} ,
+ $issuedata->{'branchcode'} ); # that's the circ control branch.
+
+ $datedue = (C4::Context->preference('RenewalPeriodBase') eq 'date_due') ?
+ C4::Dates->new($issuedata->{date_due}, 'iso') :
+ C4::Dates->new();
+ $datedue = CalcDateDue($datedue,$loanlength,$issuedata->{'branchcode'},$borrower);
+ }