You can change the time synchronization settings in vCenter Server after deployment.
When you deploy vCenter Server, you can choose the time synchronization method to be either by using an NTP server or by using VMware Tools. In case the time settings in your vSphere network change, you can edit the vCenter Server and configure the time synchronization settings by using the commands in the appliance shell.
When you enable periodic time synchronization, VMware Tools sets the time of the guest operating system to be the same as the time of the host.
After time synchronization occurs, VMware Tools checks once every minute to determine whether the clocks on the guest operating system and the host still match. If not, the clock on the guest operating system is synchronized to match the clock on the host.
Native time synchronization software, such as Network Time Protocol (NTP), is typically more accurate than VMware Tools periodic time synchronization and is therefore preferred. You can use only one form of periodic time synchronization in vCenter Server. If you decide to use native time synchronization software, vCenter Server VMware Tools periodic time synchronization is deactivated.
Use VMware Tools Time Synchronization
You can set up vCenter Server to use VMware Tools time synchronization.
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Add or Replace NTP Servers in the vCenter Server Configuration
To set up the vCenter Server to use NTP-based time synchronization, you must add the NTP servers to the vCenter Server configuration.
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What to do next
If the NTP synchronization is deactivated, you can configure the time synchronization settings in the vCenter Server to be based on an NTP server. See Synchronize the Time in vCenter Server with an NTP Server.
Synchronize the Time in vCenter Server with an NTP Server
You can configure the time synchronization settings in the vCenter Server to be based on an NTP server.