Cron doesn't behave well if you set the time backwards. Thr following
is an excerpt from the date manpage.
Changing the date while the system is running in multiuser mode should
be avoided to prevent disrupting user-scheduled and time sensitive
programs and processes. Also, changing the date can cause make(1) and
the SCCS and cron(1M) subsystems to behave in an unexpected manner.
The cron daemon should be killed prior to setting the date backwards,
> We are using Hp_UX 11.0, We reset system clock to Jan 1, 2000 and all
> the cron jobs were executed properly on Jan 1,2,3 2000(checked
> the /usr/adm/cron/log file) Later on we reset system clock back to
> 9, 1999 and NONE of the cron jobs got executed (/usr/adm/cron/log file
> does not have any entry after Jan 3, 2000) Please suggest me what
> to be done. I am sure this experience will teach me every single minor
> details which I don't know about cron.
> Thank you very much,
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Share what you know. Learn what you don't.