Have you ever needed the clock to be set correctly on an Cisco router? The answer is YES, you do need it to be set correctly, for a variety of reasons. Here is how you do it in CLI:
Cisco_2811#clock set 16:57:00 24 Sep 2012
Cisco_2811#sh clock
16:57:02.063 CST Mon Sep 24 2012
Cisco_2811#wr mem
Building configuration...
[OK]
Cisco_2811#
