UNIX for Advanced & Expert Users

Hi all,

We use cron "/usr/rdl/sc/cccron" to execute our jobs.
But sometimes it is being changed. but we are not sure when it is changed.

how could we find when cron is modified.

i checked cron by giving ls -l . but it is showing 2009 year.

ls -l /usr/rdl/sc/cccron
-r-xr-xr-x 1 nassim rdl 14111 Jun 15 2009 /usr/rdl/sc/cccron

we edit cron with the userid. the user id is test1.

also checked the file
ls -l /var/spool/cron/crontabs/test1
-rw------- 1 root rdl 403 Oct 28 14:02 /var/spool/cron/crontabs/test1.

but here it seems oct 28 2011. but i changed this cron with the userid on Nov 15 2011.

Could someone please help?

Thanks & Regards,
Divakar