Why Crontab AT 1AM Not Work, but it does at another hour?

Greetings. I have created a certain number of cronjobs (15) to be executed at certain time, but Im having issues with the time of the job, for example:

 5 1 * * * Command to be executed

Doesn’t run, but if I do something like this:

 5 10 * * * Command to be executed

Runs perfectly.

I don’t know if this have something to do with the date/timezone that I setted to my vps.

Thank you for your attention.

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This is an old one, but just stumbled across it now. Hopefully this will be useful for people still landing here from search. What I suspect was happen here was that /var/log/syslog was being rotated after the command was successfully run but before you checked the logs.

logrotate is run daily via it’s entry in /etc/cron.daily/:

# ls /etc/cron.daily/
apport      bsdmainutils  logrotate  mdadm    passwd              update-notifier-common
apt-compat  dpkg          man-db     mlocate  popularity-contest

Scripts in /etc/cron.daily/ are run daily at 06:25:

# grep '/etc/cron.daily' /etc/crontab
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )

So if you check /var/log/syslog after that point in time, it may not contain entries from before then. To confirm if this is why you can not find a log entry, check /var/log/syslog.1 for older ones.