From a logging point of view, it's interesting to have your clock set up correctly on your Cisco switches. Your switch should have these capabilities, but network admins usually "forget" to set these up.

To configure these, you need to have privileged access to your switch using SSH/telnet/console. The following works on any device running iOS (i.e. switches and routers).

Time zones are expressed as a name, followed by an offset. The offset indicates the number of hours from UTC, expressed as -hour or +hour. To know the offset for your time zone, you could look at the World Time Zone map.

In my case, for Central European Time, I would set it to this:

SW(config)# clock t  ...