Edite seu script /etc/cron.daily/0logwatch
e adicione o export DATE_MANIP=DM5
antes da chamada do logwatch.
exemplo:
#!/bin/sh
#Set logwatch location
LOGWATCH_SCRIPT="/usr/sbin/logwatch"
#Add options to this line. Most options should be defined in /etc/logwatch/conf/logwatch.conf,
#but some are only for the nightly cronrun such as --output mail and should be set here.
#Other options to consider might be "--format html" or "--encode base64", man logwatch for more details.
OPTIONS="--output mail"
# Fix Date::Manip issue
export DATE_MANIP=DM5
#Call logwatch
$LOGWATCH_SCRIPT $OPTIONS
exit 0