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Cron job executed multiple times daylight saving time

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linux-howto

http://serverfault.com – We run a CentOS release 6.2 (Final) 2.6.32-220.13.1.el6.x86_64 with a stock cronie.x86_64 1.4.4-7.el6. On Mar 31 we moved to summer time: 03:00 become 04:00. In crontab we have: 0 4 * * * /usr/bin/php /some_script.php In log we discovered that this script was executed 12 times: Mar 31 02:56:01 web CROND[1910]: (root) CMD (/etc/webmin/virtual-server/collectinfo.pl) Mar 31 04:00:01 web CROND[2492]: (root) CMD (/usr/lib64/sa/sa1 1 1) Mar 31 04:00:01 web CROND[2496]: (mailman) CMD (/usr/lib/mailman/cron/gate_news) Mar 31 04:00:01 web CROND[2491]: (root) CMD (/usr/lib64/sa/sa1 600 6 &) M (HowTos)