How config Ntp Server and time- Zone on Cisco

How Config Ntp Server

https://community.cisco.com/t5/switching/which-ntp-server-to-config-on-switch/td-p/1379080

How config Time Zone on switch cisco

https://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/command/reference/ffun_r/frf012.html#wp1018092

For example

Iran For summer

(config)#clock timezone + 4 30

No summer

(config)#clock timezone + 3 30

For see Clock Time

show clock