we have many ways to adjust the time of VCN but better way is using NTP server in order to let all network device sycn.
The NTP clock source server to Yes. after that we can insert IP address of NTP server . and for more details about the steps :
Log in to the OMU portal of the VCN500 as the Admin user.
Choose Maintenance > Unified Configuration.
Select the server for which you want to implemen****P synchronization, set Module name to OMU and Parameter type to Entire network NTP config, and click Search.



