Is there any changes in the latest IOS version, as when I do " sh run" , the statements below are not displaying..
! Last configuration change at 01:31:17 GMT Thu Aug 30 2007 by sasadm
! NVRAM config last updated at 01:31:59 GMT Thu Aug 30 2007 by sasadm
Thus, I wont be able to know who did the changes on the router..
This is an interesting problem with a simple solution. If the router believes that it really knows the correct time and date (either it has the calendar chip, it is running ntp and has learned time, or has executed clock set) then it will put those lines into the config. And if the router does not believe that it really knows the correct time then it does not put those lines.
My suggestion is to get correct time into the router (ntp or clock set), then make a config change, and then look at show run and see if the lines do not show up again.