Is the time and date on your cisco router I switch correct? Both time and date need to be accurate for things like security logs, troubleshooting logs, time based ACLs, and a variety of other reasons.
Fortunately, the network time protocol, or NTP, was created to sync the time and date on our cisco routers down to the microsecond.
NTP isn’t hard to configure with the help of my step by step article:
Synchronize a Cisco router’s clock with Network Time Protocol (NTP)