The output of the "SHOW RUN" command has this information at the very start of the output listing.
! Last configuration change at 19:08:40 CDT Mon Oct 12 2009 by cworks
! NVRAM config last updated at 19:08:47 CDT Mon Oct 12 2009 by cworks
Hi, this IOS version is not showing it:
Current configuration : 3872 bytes
service timestamps debug datetime msec
service timestamps log datetime msec
Do you know another way ?.
Here is a URL describing how to configure change notification and logging.
Joseph is pointing you in the right direction. IOS will put the date and time of the last change into the config when the router believes that it does really know the right time. And as you have demonstrated it does not put the date and time when it does not have authoritative time.
The simple solution is for you to use the clock set command to set the date and time. The better solution is to configure the router to use NTP to learn time from some source.
The router has the right time and date, but I can't see the time/date information that I need. I don't know why.
Do you have any idea ?.
My idea is that the router may remember the time and date and put them into log messages and things like that. But just remembering the date is not authoritative about correct time. Try my suggestions about using the clock set command or about configuring the router to use NTP and let us know what happens.
If the appliance has the right time (look at the command "sh clock" and if you see "." in front that means that the appliance is NOT synchronized with the time) and you don't get any information of the "sh run" then the config was changed AFTER the appliance was rebooted.
Ok, thank you, here you can see what sh clock command says:
*22:28:06.035 UTC Tue Nov 10 2009
The router has long time that it's not rebooted.
The * before the time is another indicator (similar to the one mentioned by Leo) that the router time is not authoritative (even though it may be correct, it is not authoritative). Try my suggestion of using the clock set command and let us know what happens.
There is not anything that I know of on the router that will give the last 5 saved configs. There are various network management products that monitor devices and when they see config changes will archive copies of the config. They might (or they might not depending on the particular product) be able to give the last 5 saved configs. But I do not believe that you can get that from the router/switch itself.
I always recommend that every time the running config needs to be updated/modified, to always save it in the flash with date time etc, It is a valuable recording for the future. It has saved lots of time and effort when it comes to troubleshooting especially.