Fix in the C++ DateTime class. The affected server files are included.

The following is taken from patch #537: After installation, if not
done before, the old flab files in the archive must be removed (as
openit user):

cd $ARCHIVE_DIR/license
find flexpoller -name "*FLAB*" | xargs rm

$ARCHIVE_DIR can be found in /etc/opt/openit/openit.cfg

The flab must be run for the affected period. Please proceed as
follows (as openit user):

/opt/openit/bin/flab -c /var/opt/openit/etc/daft.conf <start> <end>

<start> and <end> has format YYYY-MM-DD